Malicious PDF — malware analysis report

Static analysis result for SHA-256 d995bc3c85cf21a1…

MALICIOUS

PDF

73.7 KB Created: 2021-03-05 04:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c14b3c0e7a7c827cfc986cd625af57e SHA-1: c042c9facf72915f12d9e1aa23e3c88e5139c30d SHA-256: d995bc3c85cf21a13c705e90dbbc4fee4c8b385d8926bbdfdc526c0e0be9fd41
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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary external URL, https://jumiwimov.ru/strik?utm_term=dewalt+chop+saw+10+inch, appears to be a redirector. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of techniques used to drive traffic to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://jumiwimov.ru/strik?utm_term=dewalt+chop+saw+10+inch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464874/normal_6020a84117bb4.pdfIn PDF document text
    • https://ralufuluwifo.weebly.com/uploads/1/3/0/9/130969066/8f4d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_600a4f8cd02f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_5fe8fdef425c8.pdfIn PDF document text
    • https://peketavapi.weebly.com/uploads/1/3/4/3/134331612/7058732.pdfIn PDF document text
    • https://mulujalopopu.weebly.com/uploads/1/3/1/4/131407089/gamedobogo_torosisepuxivap_rukarerafoman_pikimijatit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482018/normal_6037395c9a768.pdfIn PDF document text
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/5149709.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383156/normal_600549d6a09ce.pdfIn PDF document text
    • https://boforotove.weebly.com/uploads/1/3/5/3/135393238/wuvekefaxuwe-rojenebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_603d7cd71c413.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_fb1d43a677cb4cfc89f2da1e915a5e4a.pdf?index=trueIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_61872d83f77b40a08852fdfb94bb9e9f.pdf?index=trueIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_c83af342ef784977b6e8e8e266a28f5c.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_2af9127773a84b9b94c41a60e11430a9.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_cd01d7909fb94f73a1944bc71e484bbd.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_1456224243894ec9824836b4623a58b2.pdf?index=trueIn 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_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 5208 bytes
SHA-256: 78b99cfbd7820b9a65988882bbb510d41bb4ddef736f437f42b4e7b0d52fa3b5
font_01_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 10364 bytes
SHA-256: 441dfdb467d623c4fc42c7cc2f1b07d00f899bf2374a38009323887d93ad1364

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