Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d503e53d727231f…

MALICIOUS

PDF

73.6 KB Created: 2020-11-29 07:27:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 12678664283a83204f4a1a0b3866a11d SHA-1: 1c8f4d08ac380a73fe5cdf2c276c0fe35876a438 SHA-256: 1d503e53d727231facf501ce8487fec7b52988a8329e52dc7c252f29788ef959
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on CDNs and S3 buckets, suggesting a link farm or content distribution network for malicious files. The ClamAV detection and ML classifier strongly indicate maliciousness, likely a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

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://trafftec.ru/123?utm_term=gta+san+andreas+android+apk+obb+compressed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f889873373d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_5fbb266fa7b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5fa30fb527949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f89d48c8749e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477408/normal_5fb7bc44786f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_5f97fc2ac0880.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/5247480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5f8c3c6893131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5fa7bd0edf04c.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/difigomisosak/12491319800.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/liseveto.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/streaming_services_comparison_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/kogutut.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/magruder_s_american_government_2003_answer_key.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 5420 bytes
SHA-256: fc65a4f76d0eaecbd3c2c0a7a13a020863026e3ee519315bf23378c28212d3b1
font_01_sfnt_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 10468 bytes
SHA-256: f6083994b2f2757272b70bf159ba7cddac7143f1ea4d44d359d344840da5cfcf
font_02_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 16660 bytes
SHA-256: a361abef9bd6614270ee78402abd4d604954a3d662fdeaa25239d8f4e4827fcc

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