Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58b115006d41266…

MALICIOUS

PDF

70.6 KB Created: 2021-03-27 18:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d073ccf87f02ac4ca1a5dd813c388b9a SHA-1: 247535562fdcd68bcf637adb61f7c583ae8afa76 SHA-256: c58b115006d41266909f6aaf3d2fea95c6a33797a56ef54f631e805bffadf8ea
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=garage+sale+pricing+guidelines
    • https://cdn-cms.f-static.net/uploads/4476122/normal_601d2f05de450.pdf
    • https://tositoda.weebly.com/uploads/1/3/5/3/135312816/jufebun.pdf
    • https://fexagoresex.weebly.com/uploads/1/3/4/3/134337575/54bdb278ed6a79.pdf
    • https://wofovado.weebly.com/uploads/1/3/1/8/131871653/7f43f19d.pdf
    • https://static.s123-cdn-static.com/uploads/4369915/normal_5ffd5c397318f.pdf
    • http://henrysavbr.site/5441797746b742y.pdf
    • http://ogranicbio.space/14052029849jgqe6.pdf
    • http://distornyup.site/7449113053xy777.pdf
    • https://cdn-cms.f-static.net/uploads/4414678/normal_600aabcc64fff.pdf
    • http://yandex-delivery.cc/7092299226fp00m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1176d340-700c-437e-b7e1-a2d9267cd6ed/how_to_reset_my_tracfone_password.pdf
    • https://uploads.strikinglycdn.com/files/ad412322-dd22-4b79-a6a9-d1769b518a22/58852682348.pdf
    • https://s3.amazonaws.com/zuses/upsc_2016_answer_key_insights.pdf
    • https://s3.amazonaws.com/wukara/jiramoti.pdf
    • https://uploads.strikinglycdn.com/files/33e1f373-4f47-4883-9c10-c9d52bd43f3f/how_to_make_a_bridge_out_of_toothpicks_and_marshmallows.pdf
    • https://uploads.strikinglycdn.com/files/f852131d-8d0d-4bf0-9dc0-027413c0b916/15622155270.pdf
    • https://uploads.strikinglycdn.com/files/c36e1056-3141-4bf0-a4f2-d3e1d15d38c7/92555645734.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_off0000d648.bin
e2603bee015c6a4692250f8bd095a802fd52d42a60a3cc4d68a23c7c96eda724
pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 5272 bytes
font_01_sfnt_off0000e847.bin
bc30978629a84b5a7f23f1595210c3f90cf0aa4c61d6231b41cc3d169d520324
pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 10984 bytes