Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5c525bfc282141…

MALICIOUS

PDF

72.1 KB Created: 2021-02-26 01:31:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 302bdb8314a239dc522abf3e53a03de5 SHA-1: 23e58ac70b46edd324936198b72065422c34c200 SHA-256: 7e5c525bfc282141dc6cddca4e473f5998be1db6e45614f5039685e7b271eb76
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, https://jacksth.ru/strik?utm_term=can+you+take+a+dmv+written+test+online, is likely part of a phishing lure. The presence of multiple external links and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or malware distribution.

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
  • 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://jacksth.ru/strik?utm_term=can+you+take+a+dmv+written+test+online PDF link annotation
    • https://robaralimojo.weebly.com/uploads/1/3/0/8/130814718/657ee009b63bac.pdfIn PDF document text
    • https://dagatofolake.weebly.com/uploads/1/3/0/8/130874029/7478c21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489988/normal_5fc6ce96565c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fd263d5a7e0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_602d5bd2bee51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_60124ef161bb2.pdfIn PDF document text
    • https://vibofizetukoz.weebly.com/uploads/1/3/0/9/130969748/05c1737.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/kipiwuxudow.pdfIn PDF document text
    • https://zutiwemozebej.weebly.com/uploads/1/3/2/7/132712207/3509133.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/bb943e71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_601d6ce9357d6.pdfIn PDF document text
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/batuvoguvugunomumebe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitirew/adjectives_to_describe_yourself.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/pizadunedikotizukol.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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 5192 bytes
SHA-256: 8423dfa409d057d13418904c7dd692806d89ef8383ce6ee47a57a57519b84f6a
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 10320 bytes
SHA-256: 199ccd5469db8ed1aa06a96b5d3bf3a7afa002388edcec007a0c8d6b01d0199d

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