Malicious PDF — malware analysis report

Static analysis result for SHA-256 245e867bd2cc000e…

MALICIOUS

PDF

78.8 KB Created: 2021-03-18 04:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 45060cea61963947469669594285c33c SHA-1: 16b4148d2099b7de2248f788b8e188334f96125e SHA-256: 245e867bd2cc000ee41190177b737510a2a698e5b2e1a3ae740982818f68673e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://mezovuduw.ru/123?utm_term=voice+recorder+for+android+mobile+free PDF link annotation
    • https://cdn.sqhk.co/riwifesineji/iiih8O6/12380710722.pdfIn PDF document text
    • http://sesalon.xyz/what_ink_does_epson_4100_use05anh.pdfIn PDF document text
    • http://yourdesk.website/idaho_fish_and_game_roadkill_reportyu6mo.pdfIn PDF document text
    • https://dofidosuxemaxej.weebly.com/uploads/1/3/4/5/134595751/pexituj-redebubilefu.pdfIn PDF document text
    • https://wedazosalewe.weebly.com/uploads/1/3/5/3/135337368/bojil-zaguxo-poveli-wuxuk.pdfIn PDF document text
    • https://labivuzixifazer.weebly.com/uploads/1/3/4/3/134310915/tixevilerazixaj-dunatopirav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478933/normal_600454a004f35.pdfIn PDF document text
    • http://mirror-x.org/temirokufitetuvixokepefomo6sg.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/tEigcjg/vupavupu.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/gjwgfIm/strategy_vs_tactics_pr.pdfIn PDF document text
    • https://kaxejawajafu.weebly.com/uploads/1/3/4/7/134776484/6259964.pdfIn PDF document text
    • https://nugadefemiwad.weebly.com/uploads/1/3/4/6/134673433/648985.pdfIn PDF document text
    • http://freshka.fun/yt_1300_corellian_freighter_owner_s_workshop_manualitt94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368954/normal_5fe54d58bb516.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_feb87ffa889e4fbd916e188763ea0433.pdf?index=trueIn PDF document text
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_2d3b940ac61e42b3be228de4330b6151.pdf?index=trueIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_8014ffbacb7149849d5851ed11b87a59.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_c03daff379e441da8ca7288458726c16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/ms_word_letterhead_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/cetoacidosis_diabetica_urgencias.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/algebra_2_connections_chapter_9_answers.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 5096 bytes
SHA-256: 9a663d9d8b01c081ed3ca05c15f270e04a2b2d4723c39c51c4a8b341152f8477
font_01_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 11200 bytes
SHA-256: df939406cfc9760ee6dafc54f204a84f0e23bf9a674375e220458cf221e502c3

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