Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f3f5981818745a…

MALICIOUS

PDF

77.9 KB Created: 2021-01-28 10:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: affc0303021bbd9c3954ed8e3100f36d SHA-1: 26cc58da669235ff74f867bcc44e8ad975025748 SHA-256: 89f3f5981818745a899b21893b9d65a06a0ab5a4d7f26a455b595ec718a54f7b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/aws?utm_term=abcd+movie+video+songs+free PDF link annotation
    • https://cdn.sqhk.co/xawodoze/cYjj6jg/17338172625.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/Hz9ggSO/movie_trivia_quiz_2000s.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/wCjjgcP/21209466557.pdfIn PDF document text
    • https://virixodebusetij.weebly.com/uploads/1/3/1/3/131383575/kipavafo_minaxilupakezok.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/eZheD2R/world_adventure_race.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/cahbj23/42639733148.pdfIn PDF document text
    • http://lifeit.pro/original_plague_doctor_mask_for_salenm8w1.pdfIn PDF document text
    • https://kofiserifopame.weebly.com/uploads/1/3/2/7/132741397/df885dc1.pdfIn PDF document text
    • http://playmarket-online.com/sinotegolenuduvufisevixo8ta1.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/gjjjiac/navneet_books_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/Lf6KCgi/38679361992.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383452/normal_5ffa41129be13.pdfIn PDF document text
    • http://prodson.space/737633634849ndee.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/uoT4jcu/shark_ion_r76_vs_r75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417664/normal_5fea25c6b55b8.pdfIn PDF document text
    • https://cdn.sqhk.co/zeterabaxax/egjih5s/sledziona_totalna_biologia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 4996 bytes
SHA-256: 02457ab02b564988f5e00e935c74b27ce34ac626827685902a47d6c08ec830cd
font_01_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 10820 bytes
SHA-256: 1b90445ee5e7287eee32109bb74ee3b8394efc8112e493820bc0efe54b751255
font_02_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71