Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a2560d0e003821…

MALICIOUS

PDF

79.5 KB Created: 2021-02-16 22:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 220e456aeffa5a848e0fb1daa82298af SHA-1: f4c77dfde1a5aec7aa825808fd8bf8518d122ae1 SHA-256: 20a2560d0e003821251358ff76af57ef64738c2a5921426cc216d16bb2fc3c3a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=medical+spanish+translator+app PDF link annotation
    • https://cdn.sqhk.co/rorajakura/bqtifuU/69955914601.pdfIn PDF document text
    • https://cdn.sqhk.co/duxajoje/ghaigha/jurupi.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/XIPjcid/world_boxing_challenge_hack_apk.pdfIn PDF document text
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/rasupiv.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/dijn0ib/yousician_piano_apk_premium.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447915/normal_6015c4a64bfda.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/jb38ZQp/neo_geo_x_arcade_stick_mod.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/8993986.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/hgez5ia/khloe_kardashian_and_tristan_thompson_e_news.pdfIn PDF document text
    • http://pesavobedevas.22web.org/zuvudusatazat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://marakolin.epizy.com/instagram_photo_size_guidelines.pdfIn PDF document text
    • http://sofizeximixa.epizy.com/video_recording_app_android_code.pdfIn PDF document text
    • http://lasikip.rf.gd/alexa_app_for_echo_dot.pdfIn PDF document text
    • http://ritanuwo.epizy.com/veronica_mars_season_3_episode_guide.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_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 5168 bytes
SHA-256: 353345693be986eddccf22a4d5dc6007285b1239c171f98c6fe20aa2f3c92fbf
font_01_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 11060 bytes
SHA-256: b4c3e8e026a92f958b56c05c243123a65fe26633666654bd20010c3b5d188ded

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