Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c132e1432eca5b…

MALICIOUS

PDF

73.0 KB Created: 2021-06-01 10:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 86e98c2d2e23a876d68ba173212cd287 SHA-1: bed88b2ebbb4154c85a82f9922d38479d04c7872 SHA-256: 59c132e1432eca5b43b27d505c751b5d96fa9b3c9f389a5dbfd388059959ae30
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to a link farm designed to redirect users. The primary redirector URL is https://inwebjor.ru/pbw?utm_term=taleemul+haq+shafi+pdf, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://inwebjor.ru/pbw?utm_term=taleemul+haq+shafi+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412174/normal_5fe82a0bb81e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5ffbfff5984d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459035/normal_60070becd8f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_60355183d23d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5fd8436521ba1.pdfIn PDF document text
    • https://tevuluzusat.weebly.com/uploads/1/3/5/3/135397550/94d9646a2bfcc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444885/normal_5ff9d07628bec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448750/normal_605a2448254bf.pdfIn PDF document text
    • https://lezojefob.weebly.com/uploads/1/3/5/3/135319065/3fd5d4d.pdfIn PDF document text
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/sobafojefe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393361/normal_5fd07df928f1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_602d2b34c7476.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0be9651-6cdc-4e9c-88d1-93a22ed71b0d/fosuvutotililerofumisesos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3fe1584-a465-47eb-8c93-0eb766aac66c/xuvedamalowaneg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d57f75-3000-4ca8-96d1-1b95aff95533/rosotowiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d3837df-2416-461e-a488-0066917ea1ce/xidigovopij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bb4c00-91d9-4846-b212-4d5022597413/xapezezukozem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6124afc-0145-4b42-8e89-9f3c363f726a/9849565577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76c6502-33a0-4387-b789-cad2e44cec6f/xanufapimapixabo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 5260 bytes
SHA-256: 9e80f6d16590969528ff335687b2f8ff70d8fa5c7ea1f9fb883bcf7b4a5eef50
font_01_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 10464 bytes
SHA-256: 1e8f8d97fd3eef5593e3f4a0d426262ce7b245399911934c1a64286008c4b0f7