Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a91f7ed8070f575…

MALICIOUS

PDF

95.1 KB Created: 2021-03-24 08:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d78a2d458dd3567bab9ce18926a8de9e SHA-1: b1c14306aa92eb51c67d7733aa14a8c2e5ac17e4 SHA-256: 1a91f7ed8070f5751cc604eaa60ca3732dbe1663abbbaa5c89987d398b5baa77
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://botokaw.ru/wix?keyword=hp+z230+bios+manual PDF link annotation
    • http://lnstagramcopyrigtservice.com/41661882478rjnhs.pdfIn PDF document text
    • http://ilmahli.com/cultural_studies_theoristsdxs1w.pdfIn PDF document text
    • http://poradoit2.site/24168642049px9in.pdfIn PDF document text
    • http://arthromedro.xyz/predicting_reaction_products_chemistry_worksheetpnlvs.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/govafexajevonadewikixari1dkmv.pdfIn PDF document text
    • http://czecheducation.space/seroromabetimkmb5u.pdfIn PDF document text
    • http://cocobeautybar.ca/how_to_archer_push_upfuhg4.pdfIn PDF document text
    • http://svarka-aurora.online/82243106538d02h5.pdfIn PDF document text
    • http://ibkreactiva2020.com/68224632339en7uj.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_7d76232c8fe74830b5e8b013912b48b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dd6dac5-2600-48d7-8195-674f47fe0a20/88641087572.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_47de8d71b42d4f9dae902b3b82b15d60.pdf?index=trueIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_ed229df6f1fb4b0b9dcf46774bb41f96.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_43998e9b0430418c90794e01792c586d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9372866-3712-44db-af13-55099c81d34f/importance_of_english_as_a_second_language_in_india.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_beec9bd951754ad195aea8ae439c737f.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_bc21b387ce9d4e29aaf1b1cec8bb2c3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71431ad6-781c-4fa6-a953-df08bb9733f5/zuxafowuran.pdfIn PDF document text
    • https://19a49760-34f4-40c2-bf27-8a214d7c07e0.filesusr.com/ugd/3283b0_c6faf01d9a884b0db1db828ab7c7caef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9839841-9706-4c1c-8768-cca45f3841ca/tim_ferriss_naval_ravikant_podcast_number.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000128c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x128C9 10856 bytes
SHA-256: 49f6b36be11a49b483982b7fba857bec67dae321c5c892b7f5a609a84a64f507
font_00_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 5460 bytes
SHA-256: 9642ac130f51c51594645c1a9aa0b8cfd8a45c738f37623b61c18ae82d86cafd
font_02_sfnt_off0001477e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477E 11652 bytes
SHA-256: 6b11dc84e82fa64ebb11ee353415995d87ff460e23fb2e0f3b173d729349665a