Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4390f9f07ba348…

MALICIOUS

PDF

94.1 KB Created: 2021-01-29 04:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 45467afde040c4510f231e78167d5996 SHA-1: 23ccda5971a5da7a7aee4c8b63ac447c9b3685d1 SHA-256: cd4390f9f07ba348d31240cd033455ffeb96818413439dbbe59a16f53a0d4e76
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily corrupted, contains references to 'atomic radius chart' and 'wkhtmltopdf', which appear to be lures to disguise the malicious nature of the embedded links.

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
  • 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://maypoin.ru/123?utm_term=atomic+radius+chart PDF link annotation
    • https://durupojivuzebip.weebly.com/uploads/1/3/1/8/131856887/6034461.pdfIn PDF document text
    • http://wei-nmvc.com/drum_set_online_record41kva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495536/normal_5ffb95ff11c9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fd2fa59e50c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_5fd91147dceef.pdfIn PDF document text
    • https://bebilakag.weebly.com/uploads/1/3/0/7/130776425/sowabanof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_5fd970114a664.pdfIn PDF document text
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/9918470.pdfIn PDF document text
    • https://vojerured.weebly.com/uploads/1/3/3/9/133999986/51588c3.pdfIn PDF document text
    • https://misurenagikokiz.weebly.com/uploads/1/3/5/3/135332419/repasavonogikatasol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teditobu.rf.gd/97128272883.pdfIn PDF document text
    • http://pewesinelukaveb.epizy.com/8358967179.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/mandatory_reporting_statute_colorado.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 5136 bytes
SHA-256: c8413a95dcc39a7b6baefda0b9ccd53341758d7b5103c9c0152c89b08def2fb8
font_01_sfnt_off00012d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D90 11944 bytes
SHA-256: 0d21232037cef1285069e6eab22bf8113f02d16bcd61d99a5bb46a46c2c86546
font_02_sfnt_off00015630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15630 16096 bytes
SHA-256: 9fa8bf34b392e54777a73878461b2c201b7cd697526f69512042a84d0f933758

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