Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7baa21cebcd7a35…

MALICIOUS

PDF

71.9 KB Created: 2021-06-01 02:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dcb6b70452939735759a48b2ff9df41 SHA-1: d163b33f6c9e5ceb35c2a5b5a410506f052ca775 SHA-256: c7baa21cebcd7a35cece9814c62d1596b28852d90293c337d77e99e6e7b29d3c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/pbw?utm_term=jenny+lind+crib+assembly+manual
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/5291001.pdf
    • https://livafuti.weebly.com/uploads/1/3/4/6/134628119/povev.pdf
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/7803595.pdf
    • https://vururera.weebly.com/uploads/1/3/4/4/134493513/zirusifurarolag.pdf
    • https://katifakemu.weebly.com/uploads/1/3/1/3/131381151/75bf26f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xojifot.pbworks.com/f/super_smash_flash_2_unblocked_663.pdf
    • http://didaneguk.pbworks.com/w/file/fetch/144429102/jufof.pdf
    • https://uploads.strikinglycdn.com/files/73e38e8c-72dd-44f7-9b1c-8ea3fa3ea2aa/22276752700.pdf
    • https://uploads.strikinglycdn.com/files/c1a0f8d5-2e2c-4077-8e5b-02e8f0340755/remuvobuwotoziko.pdf
    • http://lakebimutep.pbworks.com/f/motijajefore.pdf
    • http://bekivuxuga.pbworks.com/f/24272119358.pdf
    • http://supatibu.pbworks.com/f/how_to_describe_a_sunset_to_a_blind_person.pdf
    • http://sejuworepow.pbworks.com/w/file/fetch/144419013/54771498722.pdf
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144424545/4329020421.pdf
    • http://visetululiv.pbworks.com/f/how_is_tax_calculated_on_a_private_limited_company.pdf
    • http://supatibu.pbworks.com/f/gasuniziriju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6b.bin
71b5d4a170d0ecdbc7f1b8992432f6264c0190ba1b1fac06340d1c05f44ab77c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 5316 bytes
font_01_sfnt_off0000ec6c.bin
de2b38a8b11a5ad533eeb231f641e5d4ce8a62daee0180c2e9bf4674a4491eea
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 11244 bytes