Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f809edf4529d1f8…

MALICIOUS

PDF

106.3 KB Created: 2021-02-16 05:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 637b9714409f9bb6fa8aede866e79217 SHA-1: cd393249cac7d5a9b7257c5f239529cb3cabedfb SHA-256: 8f809edf4529d1f8f195a6c896126d8fd76ecba1930fa9a662e34a4d7e89ddb8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of low-quality links, likely for SEO manipulation or to host malicious content. The presence of external URIs suggests the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=go+math+chapter+8+review+test+answers+4th+grade PDF link annotation
    • http://filanion.online/xugoj5iicl.pdfIn PDF document text
    • http://kino-vezde.ru/85428895007au0ys.pdfIn PDF document text
    • http://itfamily.pro/wagal2m36p.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/7481596.pdfIn PDF document text
    • http://ehaberdevlet.com/93772866169cy59e.pdfIn PDF document text
    • http://poradoit1.site/akira_2016_kannada_film_songsz3moi.pdfIn PDF document text
    • http://momijuluxesapek.iblogger.org/jumbled_sentences_for_class_6_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388405/normal_5fe225e5bdf94.pdfIn PDF document text
    • http://dimax.website/106781890149lyqo.pdfIn PDF document text
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/nuzatepujafige.pdfIn PDF document text
    • http://tersq.fun/align_center_button_androidefrlt.pdfIn PDF document text
    • http://agentsoft.space/mofanaburesevodabupuxev7m4bi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanizezuzodujo.epizy.com/3262885378.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/61943812925.pdfIn PDF document text
    • http://tuwesexo.epizy.com/hollywood_reporter_phoebe_waller_bridge.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/99472826060.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_off000161a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A9 5920 bytes
SHA-256: a35a21270d144b24104ee10b1f4c629154e28a199982ef62524fdc4572245825
font_01_sfnt_off000175c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175C1 10996 bytes
SHA-256: fdce7234fc09ad6d4879b87f2edd8935d71eea532181928018554199758a70f3

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