Malicious PDF — malware analysis report

Static analysis result for SHA-256 e924bf7bb69b1613…

MALICIOUS

PDF

79.3 KB Created: 2021-02-24 21:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cc00c73700d803be4331ae5087e33f49 SHA-1: 346a15264a1a250f66f96a7eed6977d7a0e1b0ba SHA-256: e924bf7bb69b1613f3217dcfc32aeff3f5f56d28fddff18f77aa791732bf6c4d
134 Risk Score

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 hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports a phishing or scamming intent. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=scribd+vs+audible PDF link annotation
    • https://cdn.sqhk.co/vodadavubex/hie9vgh/7082599503.pdfIn PDF document text
    • https://cdn.sqhk.co/sisamide/0jcQOjf/nawuborikufalenuzanotubak.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/UgFidhi/resident_evil_7_game_download_android.pdfIn PDF document text
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/sufobatuzadusaj.pdfIn PDF document text
    • https://wazivako.weebly.com/uploads/1/3/0/9/130969042/jididetuwam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_6015efbfca613.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/g8idBWv/18074898093.pdfIn PDF document text
    • https://xeziguga.weebly.com/uploads/1/3/5/3/135392729/digikamudutetozaku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5ff5e1cf21848.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/lotemimamutunitevi.pdfIn PDF document text
    • https://zodovamerevi.weebly.com/uploads/1/3/4/3/134316438/fatebi.pdfIn PDF document text
    • https://rusuzewaridoxi.weebly.com/uploads/1/3/4/7/134761315/tosoke-nifis-worozuvusoruwok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491152/normal_6005f2e309272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://solazagu.epizy.com/bitdefender_2018_free_trial.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/hungry_shark_evolution_hack_apk_godzilla.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/36178935947.pdfIn PDF document text
    • http://gerufufa.epizy.com/73925417979.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/modyul_7_esp_10_answer_key.pdfIn PDF document text
    • http://xivegujox.epizy.com/xatifotupevufifurevibebo.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_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 5236 bytes
SHA-256: 73147b9ccf088270356f47dc547333207fe6fcde34f5e74775de7e252b9d1401
font_01_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 10560 bytes
SHA-256: bca4fba6f4258adaf87e0990ce78ffafb3499c71702d2902566680335ae471d8

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