Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6eabe88ca2701af…

MALICIOUS

PDF

77.0 KB Created: 2021-02-25 19:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5458e81629fb5623d0cdde87c74aa343 SHA-1: 87100ae9025d1ecedc80095df07e106918d33bea SHA-256: f6eabe88ca2701af1ffa1021254b6ed1e7b76c3792beaaf2eb3af79948739b2e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=popular+speech+topics+for+grade+5 PDF link annotation
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/zawolises-solujaji-bitonusaf-lanukomev.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/jdF5EB1/police_bike_driving_3d_mod_apk.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/7468a744c7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376362/normal_600259e646884.pdfIn PDF document text
    • http://fito4ka.xyz/500192079848xst5.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/26_week_money_challenge_5_000.pdfIn PDF document text
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/5a1fadc47217e66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450045/normal_5febf4330f582.pdfIn PDF document text
    • http://leyloften.online/jam_chill_out_speaker_instructionse7ewg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_60333eb98fe0d.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/how_many_ounces_is_a_medium_sized_sweet_potato.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/57613368990.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386828/normal_5feb6e1a1dc63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_5fe6db171c05c.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/bjb48ih/skylanders_academy_cynder_gallery.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/PeihihA/laxufi.pdfIn PDF document text
    • https://cdn.sqhk.co/gilevetu/7Hgdbu9/mebil.pdfIn PDF document text
    • https://pesakezered.weebly.com/uploads/1/3/4/7/134729162/ruvufatoziket.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 5540 bytes
SHA-256: 6f8d26904cd0b6da8e7b0a3da6e0b3233e19ca8d9999badbcb3722543271014f
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 10280 bytes
SHA-256: 665d5630043043947162ef78dcc2863c4a57d4d8a64dd6e408f7cb565540186a

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