Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a72913fe45fcbe9…

MALICIOUS

PDF

92.0 KB Created: 2021-06-01 06:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75e990bb0d4ec796faeab816c2a1eb80 SHA-1: 7d131bf4dcbf6630a31b1606414ed27b258ef3ea SHA-256: 8a72913fe45fcbe9adf9a8894c09b8d87ea6ea862d3ade871d594c8c9c83be19
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://chcial.ru/pbw?utm_term=how+to+level+up+so+fast+in+prodigy
    • https://jiwifibim.weebly.com/uploads/1/3/1/4/131437351/medod.pdf
    • https://static.s123-cdn-static.com/uploads/4368984/normal_5fcea77a8f4f7.pdf
    • https://cdn-cms.f-static.net/uploads/4449399/normal_6038ef755aa1e.pdf
    • https://cdn-cms.f-static.net/uploads/4472204/normal_605d66558eb55.pdf
    • https://mosodufenu.weebly.com/uploads/1/3/4/8/134889918/5dfbd.pdf
    • https://fegalovawi.weebly.com/uploads/1/3/4/3/134349911/af1e7.pdf
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/timivofonu_newikaki_gidodo_dojutudilosol.pdf
    • https://cdn-cms.f-static.net/uploads/4469374/normal_6022b2bfa6115.pdf
    • https://rodazikajoreme.weebly.com/uploads/1/3/0/8/130874285/fenujefusej.pdf
    • https://cdn-cms.f-static.net/uploads/4411917/normal_6034436ff1af8.pdf
    • https://static.s123-cdn-static.com/uploads/4409420/normal_5ffd1de4a76d2.pdf
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/pofunovubis.pdf
    • https://kapelasijad.weebly.com/uploads/1/3/4/3/134312752/resenofut_xezuwita.pdf
    • https://bibasalerudo.weebly.com/uploads/1/3/1/8/131857029/4279744.pdf
    • https://static.s123-cdn-static.com/uploads/4456121/normal_600799452aa81.pdf
    • https://desalipi.weebly.com/uploads/1/3/2/6/132681317/jomezino.pdf
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/344189.pdf
    • https://bubawupuga.weebly.com/uploads/1/3/4/3/134380130/situboxaneweg.pdf
    • https://xovodozavaso.weebly.com/uploads/1/3/1/0/131069890/796442.pdf
    • https://cdn-cms.f-static.net/uploads/4378381/normal_5fd0e7cb1eb35.pdf
    • https://cdn-cms.f-static.net/uploads/4408587/normal_60208a49db799.pdf
    • https://static.s123-cdn-static.com/uploads/4428038/normal_5fc8a3613a648.pdf
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5ff4c57ae596e.pdf
    • https://static.s123-cdn-static-d.com/uploads/4366395/normal_60b5aca5a84fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011089.bin
a01f6abe409115507c7ef7dac633d11cc3fa3c86200315bdfa2c5127a5de4e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 5424 bytes
font_01_sfnt_off0001232a.bin
83452e5093e62e30304f38434d76bcef2755e63201cf9dc10d5d6afde9b47e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 11640 bytes
font_02_sfnt_off00014b56.bin
8364a7b7ba0d079a5b06b86392c8e8d218a8129bfbcbcc6f41c0a9275d1f621e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B56 16088 bytes

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