Malicious PDF — malware analysis report

Static analysis result for SHA-256 175a42d4b9fbd474…

MALICIOUS

PDF

70.8 KB Created: 2020-12-23 05:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e96ee8858060545e95c91997b78bd0e9 SHA-1: 15b93a063138c54f09ee585ee1720a693180d599 SHA-256: 175a42d4b9fbd474a862a97c8954411c8e6dda762686331c84fb0a3f510c72e3
244 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. It contains a large number of links, many pointing to disposable hosting or redirector infrastructure, suggesting a link farm or phishing campaign. The primary malicious URL identified is 'https://traffking.ru/123?utm_term=dayton+audio+apa150+schematic', which is likely used to redirect users to further malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=dayton+audio+apa150+schematic In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476952/normal_5fdaf8d905846.pdfIn PDF document text
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/222110476229630.pdfIn PDF document text
    • https://najunores.weebly.com/uploads/1/3/4/3/134381484/8992390.pdfIn PDF document text
    • https://mixodozom.weebly.com/uploads/1/3/4/3/134333910/luxadalapux.pdfIn PDF document text
    • https://piwebodowumogoj.weebly.com/uploads/1/3/4/8/134857209/winifulerilapakewowa.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/pegatunalorobuteguve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5fa6af477fed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_5f9abcc768d1c.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/a67788f4b502145.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/308877fd-dabe-4fb7-8067-6b13188124aa/60076251914.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/11536587602.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_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 5604 bytes
SHA-256: e50d33ddcc8d68c4c2813a12492fbcaf762d8b9e4d4787cceec358d41014ce64
font_01_sfnt_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 11132 bytes
SHA-256: 24eb3845cc07d00ad21997aaeed282b84198c956560198db3182fcdc2184c2be

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