Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b71c04c23ed415…

MALICIOUS

PDF

134.3 KB Created: 2021-03-16 07:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c0c16e7111453192e3ffbba0a376a1c7 SHA-1: 57c7bfc740aa0f8dc6c1f7c1a514856c99fae1eb SHA-256: a5b71c04c23ed415b3f0dd4e3ba856655dce6e53b9256eb4b56612b2d81b62a0
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple critical heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to manipulate search engine rankings or redirect users to malicious sites. The ML classifier and ClamAV also identified it as malicious. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/wix?keyword=economy+of+mesopotamia In PDF document text
    • http://deemonatrafik.xyz/65034982390mo6dv.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/balanitis_tratamiento_colombiaetwas.pdfIn PDF document text
    • http://kupivse.xyz/94347386103x7ah.pdfIn PDF document text
    • https://bavipemafenun.weebly.com/uploads/1/3/1/3/131398101/nakem_nugilekufukesov.pdfIn PDF document text
    • http://supportcopyright.net/how_to_type_and_symbol_in_latex31q78.pdfIn PDF document text
    • http://o-karte-kopilka.com/estructura_del_texto_informativo10zkx.pdfIn PDF document text
    • https://jatowuwovusi.weebly.com/uploads/1/3/5/9/135981640/katizifevobefasu.pdfIn PDF document text
    • https://kalozepi.weebly.com/uploads/1/3/0/8/130814360/9789931.pdfIn PDF document text
    • http://tumbochka.space/nudegalelilifevmq5f8.pdfIn PDF document text
    • http://circus.market/will_there_be_more_michael_vey_books4h8fr.pdfIn PDF document text
    • http://iqecoportal.ru/70259447474cdp4z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10ecbbd-d79b-41fe-a579-a6c54d54c849/do_blood_pythons_make_good_pets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be63aca5-0597-4ef4-840d-2648e3501c1a/le_voyageur_contemplant_une_mer_de_nuages_commentaire.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_479a96d8bce24d73a793658336e9e4e0.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_01db4018481046edae7db7a01bd636f7.pdf?index=trueIn PDF document text
    • https://b3df6b87-ca8d-4c26-b815-8c697753997b.filesusr.com/ugd/896a32_0728de6f0d84422d987bf64eb4556114.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_0a1d06327f754a39b02986cf9835473b.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_43cd38091bdb4fd181a6a1fb13a4e0e2.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_8cddec2225dc4ae2b83c8a4f1e545355.pdf?index=trueIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_16992b5bc8df4a609453ef35f67deb8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c54dbfa-c4d4-4588-9812-f0cb6703f846/karns_church_of_christ_sermon_outlines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09abffc8-50c0-49eb-9053-8edfed86f2d5/xorogowijakamisij.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001da4a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1DA4A 18724 bytes
SHA-256: 963ec866fea1ac218e1a3b13cdf32519c445202aef65d96e625e0405c4f92f3d
font_00_sfnt_off00019778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19778 5092 bytes
SHA-256: 2fe755a66d5376b4a9ce55ff95dc9585e012a20a1b895addbd6c2b1c70405198
font_01_sfnt_off0001a8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8D1 15944 bytes
SHA-256: 93cf6c43a320ee4eba83a7eb8f63bb5dd6888ea583714914885adb46470efa95
font_03_sfnt_off0001f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F836 6676 bytes
SHA-256: b5e0b4ac88483e7b18f1f9bbffce545ee6b51fdec323a23d5c9da06f5f690de8

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