Malicious PDF — malware analysis report

Static analysis result for SHA-256 9956cd785fc6d2ea…

MALICIOUS

PDF

67.3 KB Created: 2020-11-11 22:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 787ca23513ad78c10725a061729544e9 SHA-1: 0964a467727c2e0b800e25c6317e7e52ca16f4e7 SHA-256: 9956cd785fc6d2ead2b93d740008d58288a0598aa5e83a4ac149ab76804c46ad
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, identified as a link farm, suggesting a phishing or SEO poisoning attempt. The document's content, though heavily obfuscated, appears to be related to a calculator, likely a lure. The presence of multiple external URLs, including those hosted on Weebly and other platforms, indicates an attempt to redirect the user to malicious sites. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=even+and+odd+trig+functions+calculator PDF link annotation
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/pejajofedaxevaw_kozadesupuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5f8d0c14eac7d.pdfIn PDF document text
    • https://tujulita.weebly.com/uploads/1/3/4/6/134687611/janavoxasebu-reradawus-repuxawuxejaper.pdfIn PDF document text
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/betadezosotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_5f8c1bcddd2d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f8ea195bcf23.pdfIn PDF document text
    • https://wiwetone.weebly.com/uploads/1/3/4/6/134660192/5675690.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/lanadez.pdfIn PDF document text
    • https://sajenaviwabawi.weebly.com/uploads/1/3/4/2/134266368/5701737.pdfIn PDF document text
    • https://denasigetul.weebly.com/uploads/1/3/4/3/134332190/54863c8af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC840 5204 bytes
SHA-256: 9f4fdd4648b699b719dd1ee5a253497bfa25146851f1a606b3f27b97b2d7aeaf
font_01_sfnt_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 11412 bytes
SHA-256: 75a562c0dadac1524522a097d5347821346400ecfaec43d1c1d107ff8f3054b0

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