Malicious PDF — malware analysis report

Static analysis result for SHA-256 56840ccb2940353c…

MALICIOUS

PDF

74.5 KB Created: 2021-04-01 07:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3538da14c65509e18f423d5c4c3041de SHA-1: e19fc4838eba52e089a748fd5157b6794ae4c22f SHA-256: 56840ccb2940353cb509684443a803617533895bc42b99415785f760ce4a41ef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the primary external links points to a URL that is currently unknown but is part of the suspicious link farm.

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-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://nipisod.ru/strik?utm_term=what+were+the+moving+lights+in+the+sky+last+night
    • https://wolixakeju.weebly.com/uploads/1/3/6/0/136002716/zazim.pdf
    • https://japutiluzot.weebly.com/uploads/1/3/5/9/135991977/6801941.pdf
    • https://static.s123-cdn-static.com/uploads/4370089/normal_600984e5d6f6f.pdf
    • https://wosapinilesodiw.weebly.com/uploads/1/3/5/3/135347506/8313932.pdf
    • https://static.s123-cdn-static.com/uploads/4457320/normal_5fe1b824c6546.pdf
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/bivudopugesaju-sijesudesiwuzow-zexeza-dumavu.pdf
    • https://pawiwojofidinof.weebly.com/uploads/1/3/4/4/134458390/0b96e5b9a8d.pdf
    • https://cdn-cms.f-static.net/uploads/4421048/normal_605ef6dab55f4.pdf
    • https://static.s123-cdn-static.com/uploads/4403533/normal_5fe240624df89.pdf
    • https://cdn-cms.f-static.net/uploads/4423750/normal_602437aedc398.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b54795ea-a726-4d4a-a0d0-6d0a34235dfe/29984705337.pdf
    • https://s3.amazonaws.com/pogolo/lotus_sutra_mantra_in_english.pdf
    • https://s3.amazonaws.com/paropabaru/92406005150.pdf
    • https://uploads.strikinglycdn.com/files/163c13ca-2ddc-42ea-86e7-811c7233f29a/manual_de_procesos_de_una_empresa_constructora.pdf
    • https://uploads.strikinglycdn.com/files/e1070359-9514-46cf-a588-6bd3d76298d1/jemiduve.pdf
    • https://uploads.strikinglycdn.com/files/d6056fdb-a588-4187-b8f7-9e7d7028b517/34622641743.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_off0000e686.bin
3a03b8d19ea8dad1e8ee468be38419b14739b2d234e754ed4386cadff1740ee7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 5428 bytes
font_01_sfnt_off0000f8f3.bin
a2786a45759da4351a92bd1fdc956efd39edb27832ef157434c0fa490fdb5361
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 10736 bytes