Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1b4ae5d723f99f…

MALICIOUS

PDF

70.5 KB Created: 2020-11-25 15:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f81e25bd2fd32f0b0962f0fccc0e30c SHA-1: 1d3c2fa65573e907233b4453c03d7e62b4bba08c SHA-256: 3a1b4ae5d723f99fa90c13855db435463cf25ecd82a3b08e33782f7aea14da11
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one prominent example being 'https://s3.amazonaws.com/sowewazulejewi/treatise_crossword_clue_6_letters.pdf'. Another external URI, 'https://trafficel.ru/strik?utm_term=science+and+the+akashic+field+pdf', was also extracted. These links suggest the document is part of a scheme to drive traffic or distribute further malicious content, aligning with phishing or SEO abuse tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=science+and+the+akashic+field+pdf
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5f94a663a9928.pdf
    • https://gidepezugubuwo.weebly.com/uploads/1/3/4/7/134766768/vupovepi.pdf
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5fae0f4c27ef0.pdf
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/f8eb94.pdf
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/kaxudadub-dajurumoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sowewazulejewi/treatise_crossword_clue_6_letters.pdf
    • https://uploads.strikinglycdn.com/files/0b640a2a-9f37-4e9e-9708-7d1ace900889/rexavewelebif.pdf
    • https://s3.amazonaws.com/setaxilitozuko/2724747476.pdf
    • https://uploads.strikinglycdn.com/files/1dc0e04d-103f-4194-ad28-27d44a2f5b6a/bakebixifirafigiwonoxa.pdf
    • https://uploads.strikinglycdn.com/files/5910af26-c0ff-474e-98cc-a8165ba87cb1/mozorizirebiloki.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/trend_honing_guide.pdf
    • https://uploads.strikinglycdn.com/files/993b24e3-9eae-4369-b08b-7057d68838b2/sigagozizibefano.pdf
    • https://s3.amazonaws.com/zunewidimem/jesamikajiwufowegagab.pdf
    • https://s3.amazonaws.com/jiwisigetizoxif/pakupenonubaka.pdf
    • https://s3.amazonaws.com/tamobalasu/nigerian_dwarf_goats_for_sale_in_mo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d995.bin
2760c5440a2b9dfd88418b719b608a059f46df61c95f732ba0be685570436161		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 5312 bytes
font_01_sfnt_off0000ebad.bin
b96751a6231b92eced75e637fb089cf3d5cc309b4b70f6d04255efdc4601b54f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 9804 bytes

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