Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f9fa21e8367757…

MALICIOUS

PDF

77.5 KB Created: 2021-03-29 12:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 814dd5fa9bb91027bc50dbce727456d4 SHA-1: c10fce23af7414c69a2085ea2f991a8768618f88 SHA-256: 69f9fa21e83677578714532771e603beb861bbdeb9b511bbca78dd1ee9d2e68c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, indicating it functions as a link farm. Several heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the presence of numerous external URLs points to an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=beautiful+creatures+2+pdf PDF link annotation
    • https://rugibabolunape.weebly.com/uploads/1/3/1/4/131454120/sisiluwodipesuk_sunumize_samagela_vekoze.pdfIn PDF document text
    • https://cdn.sqhk.co/titolegun/zAgdhhg/score_hero_3d_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6020d3f11eadc.pdfIn PDF document text
    • http://irbestate.ru/908467192172cg6q.pdfIn PDF document text
    • http://phtech.site/hold_my_hand_song_ringtone7kvgx.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/ggi7ijd/idle_war_legendary_heroes_hack_mod_apk.pdfIn PDF document text
    • https://pusudojajepi.weebly.com/uploads/1/3/5/3/135322366/wenejaka-xoked-salujuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473642/normal_600191d150620.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/gcaifgh/best_rainbow_cake_in_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/jhVgeha/hd_screen_recorder_full_version_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/fWjcjia/liriwukodiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_5fd28a7820d6a.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/1a2e73eb54.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/hetw1M6/free_fire_wallpaper_download_hd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_5ff097ad4773e.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/gjifpiY/wixigababuwodibadarej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_60157f0f1ca1a.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/bFH6Wbx/16721452427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_905d6c9c608849c490af9575c1bfa9b0.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_4a128b8daa134fb397489b4e28d00922.pdf?index=trueIn 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_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 5328 bytes
SHA-256: 4918b95c3acd22ad697993ae3ad25115625257c523ae75da9a0d5839935ba5d1
font_01_sfnt_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 11288 bytes
SHA-256: 06d6ba9a65ed00e33f87e779a98065175bc836867a8dd796a15a5c8a9e365e4c

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