Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c1bcddc33de28e…

MALICIOUS

PDF

80.3 KB Created: 2021-02-19 23:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9dd1a69ddaafb63f713b2ce1d2e8bc8b SHA-1: d30e49b1fa52fe49e75048a1e7bf238fe1d7874e SHA-256: 26c1bcddc33de28e3f49e42750a328ae31fa9baaada8c57311fe69285364cdcb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_LINK_FARM indicates the document contains a large number of external links, with the primary one being `https://baarspo.ru/strik?utm_term=the+true+story+of+the+three+little+pigs+stem+activity`. This suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution, masquerading as a STEM activity resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=the+true+story+of+the+three+little+pigs+stem+activity PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447079/normal_601809bd2899b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_6023fb3f8c14d.pdfIn PDF document text
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/9789670.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412896/normal_5fce2804b6fcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366628/normal_5fce5cad96e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5fd1414524a42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484399/normal_5ff49f4e28f9e.pdfIn PDF document text
    • https://rabizelen.weebly.com/uploads/1/3/1/4/131453176/setovexupuvumika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fcc5e1c1391f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_5fdb030e3c444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488822/normal_602e44fe0bff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_602b41fd3d1a8.pdfIn PDF document text
    • https://lazesomixasima.weebly.com/uploads/1/3/4/5/134588612/fugetesarik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369179/normal_5ff46ea6750af.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/fidajeziv-wapuvawonilad-deliliduja-nivokedosu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dufeniwa.rf.gd/vinujegutumupuramoj.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_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 5540 bytes
SHA-256: 17075c3f92a409e24727b8ac3c2c84cfe068d7a1febe90c81826cd7995f0de07
font_01_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 11528 bytes
SHA-256: 7979c3e0cd4131773e296582dacc6748b76f649fc01a32696ffe735b3122d68f

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