Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb71577790cf37db…

MALICIOUS

PDF

91.0 KB Created: 2021-03-22 22:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 424472113276816e8f25318d4a821d33 SHA-1: d199698374051063ca75aecd972ddc78c7232e61 SHA-256: bb71577790cf37db1a47312c8e5eba07c75ca82a2eece5935851fc5a621ca763
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, embedding numerous external URLs, several of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://pelibifir.ru/wix?keyword=how+does+iago+manipulate+cassio+after+the+lieutenant
    • http://cesaregaspari.com/sajenisobaxufejip04c6z.pdf
    • https://cdn.sqhk.co/fabozesemi/g4Ixjia/mad_monkey_kung_fu_training.pdf
    • http://sreview.online/jomodanoxoxeg0e00i.pdf
    • https://cdn.sqhk.co/zivuzigup/nRjchj4/15710554474.pdf
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fd11b53894c9.pdf
    • http://wokodanib.getenjoyment.net/misotavujoletomes.pdf
    • http://piwulag.sportsontheweb.net/supplier_chain_management.pdf
    • https://cdn.sqhk.co/vaxarogajib/ggnMhgV/world_war_brothers_ww2_fps_mod_apk.pdf
    • http://raisinshq.club/wilton_decorating_tips_chartocicj.pdf
    • http://summerita.fun/84882733278xcsbw.pdf
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5fffcf3060d5a.pdf
    • http://trafikcezaodebayisi.com/classifying_triangles_by_sides_worksheetg4ov6.pdf
    • https://cdn.sqhk.co/jirudumom/ejiWgdC/nogomuwafuxururuxuxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://likutolejit.onlinewebshop.net/credit_appraisal_report.pdf
    • https://679f922e-18a3-4497-ac16-78328480398c.filesusr.com/ugd/f34823_893310f62c8a4c75aa0708fab259398b.pdf?index=true
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_3eb0242c4d4b46f1a60cd06f973721b8.pdf?index=true
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_fb6e1ca3dd124fe4bf562f19b1819db9.pdf?index=true
    • https://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_d6209c95f2f7419db5d05326597fb161.pdf?index=true
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_d1bf7003ab6346bfb72b13b19f80a000.pdf?index=true
    • https://0c241ebc-151b-48bf-a4db-a9f2ee65d67b.filesusr.com/ugd/c17081_223ecd3b4d8545c3be5b29c8d8385643.pdf?index=true
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_d4623304d6ab40eb9fd6d090b188d7fa.pdf?index=true
    • http://torejejowomu.myartsonline.com/voxizuwujesulemawiz.pdf
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_9f11fb55c8bb41e7a056a1931f8b482c.pdf?index=true
    • https://721ea522-a1f6-4523-903e-24b3c8014629.filesusr.com/ugd/5a834c_590bf936eae7473c87f11a34a9784518.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012667.bin
0e10d152306e953d4d117f0c243be2a21e7b181a402deea07fffd56c152a4d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 5624 bytes
font_01_sfnt_off00013971.bin
ff1afa2a6c3e39eef81b8b6b033afa2adc9c679491975923185875b8fe942029		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13971 10912 bytes

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