Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc1bc850b6b1a71…

MALICIOUS

PDF

79.9 KB Created: 2021-02-28 13:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fb33d4509e12b504f84f815274812843 SHA-1: 29c74c56fb5150ffc9f54cf4cfd2b66a80e1e4de SHA-256: 6bc1bc850b6b1a71cdc542f59d54aead4fe2637f2c6527e2cc400113f9f5ff22
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external URIs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the structure of the document point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=the+beautiful+and+damned+meaning PDF link annotation
    • http://finipupote.mywebcommunity.org/58232325006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_601300098cfe0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501774/normal_5fe00372d4c09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480403/normal_5ffcb48372c21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475572/normal_6005e641500e9.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/hhwCEP2/retrowave_art_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460682/normal_603138f19bd55.pdfIn PDF document text
    • http://rubisteq.online/bhairava_dweepam_telugu_movie_mp4_freelp9fg.pdfIn PDF document text
    • http://dresdenpharma.ru/how_to_lose_fat_while_weight_training778ds.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/wQpvja8/jesuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keloxodo.epizy.com/tratamiento_bacteriuria_asintomatica_embarazo.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/what_is_gendered_institution.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/44329013223.pdfIn PDF document text
    • http://jujobope.atwebpages.com/cancer_data_management_salary_2019.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_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 5136 bytes
SHA-256: bf175387cb1b659e522e23213ef353b1d91948d04463ac86860fbacf6bef34c1
font_01_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 15668 bytes
SHA-256: dc9648edb9dd2f059316c36ecc52e4b2b47085e52e26f0f55c58715f714ed0b4

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