Malicious PDF — malware analysis report

Static analysis result for SHA-256 b277672ae8ee71c5…

MALICIOUS

PDF

71.7 KB Created: 2021-02-02 10:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d72e8844351ed002773371b447e07863 SHA-1: 21365fbe6fedce4eca5760e3657175d51c269452 SHA-256: b277672ae8ee71c582f099a65a475fa65bb7a789ea3e3051ef1a8fed42e7dc0a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

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://jottigo.ru/123?utm_term=denon+dn-700+manual PDF link annotation
    • http://my-favshopd.online/ancient_bowling_multiplayer_bowling_games_onlinec53bv.pdfIn PDF document text
    • https://tizupimarijifik.weebly.com/uploads/1/3/1/6/131606002/8258953.pdfIn PDF document text
    • https://litiwufedoza.weebly.com/uploads/1/3/0/7/130739575/motiliwu.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/ifmhauS/the_last_remnant_remastered_switch_vs_ps4.pdfIn PDF document text
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/nikevaxaxoro-wunoj.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/gjmbhf4/remove_curse_werewolf_5e.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/ibKnhe2/vufifewelemumukolotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_5fe627fea1d8b.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/9G0hghj/boku_no_hero_academia_amino_espanol.pdfIn PDF document text
    • https://cdn.sqhk.co/tujuvemevo/jj7ahjn/sage_the_gemini_and_jordin_sparks.pdfIn PDF document text
    • https://xibemorebag.weebly.com/uploads/1/3/4/3/134355918/sepod.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/iXuEjen/bus_simulator_indonesia_pc_online_play.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450039/normal_5fcc996f9be36.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/8059470056ixnlm.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/idle_heroes_tier_list_2020ccvlh.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/icgejby/jodode.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/yha7jgN/free_mp3_downloads.pdfIn PDF document text
    • http://itwomen.space/gasedajazu68x1h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452154/normal_60061149b8535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_5fd102fec06fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_6017c066e6c72.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_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 4948 bytes
SHA-256: bb2fb01005f61a1372834fdc002cdcc20aebadc130e7897d04e1954586168d68
font_01_sfnt_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 12784 bytes
SHA-256: 5bb7abc136a5852ceb1a7e17dbe1079b843e6f201ddfb1b6944910185cd78be9

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