Malicious PDF — malware analysis report

Static analysis result for SHA-256 926a03b20e37866a…

MALICIOUS

PDF

72.6 KB Created: 2020-11-23 23:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d0fbaf33a9fb222e03a5b88dc7c2753f SHA-1: 7175b05394f51edf21b6e2a21492cedd9598d9e0 SHA-256: 926a03b20e37866a4728cbf059be6c34ac78070da3ea352b2074800ad0b4ecb4
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services and redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=latex+align+equations+in+table In PDF document text
    • https://zidinekolinom.weebly.com/uploads/1/3/4/5/134516346/sigiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_5fa7dd6ccd0d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_5fa2bbb7a1782.pdfIn PDF document text
    • https://weragekebikibu.weebly.com/uploads/1/3/4/6/134670115/6883056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f9265320edb9.pdfIn PDF document text
    • https://lemarowaverixax.weebly.com/uploads/1/3/4/3/134371099/xetevigizevulef_dixozew_fadaboxubome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8711c7519b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_5fa7bf463dd36.pdfIn PDF document text
    • https://pugerazetowed.weebly.com/uploads/1/3/4/3/134341851/gijibufunovis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_5fae84c988eac.pdfIn PDF document text
    • https://woxevodojagub.weebly.com/uploads/1/3/4/6/134623787/3298109.pdfIn PDF document text
    • https://vidapinuluselas.weebly.com/uploads/1/3/4/8/134865598/4083556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5fa407dd55394.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
    • https://s3.amazonaws.com/wuniku/cyclical_theory_of_history.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 4916 bytes
SHA-256: 4566a0455dd49892d6fd15dc3553f2da0461022dbe751acee6650cec5dec8d57
font_01_sfnt_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 11780 bytes
SHA-256: bba7a2789c59cda59d5eda1a1a1c91d1a506bb9466adda693ec4d002f82a7572
font_02_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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