Malicious PDF — malware analysis report

Static analysis result for SHA-256 d488517d9164eb4f…

MALICIOUS

PDF

102.3 KB Created: 2021-04-07 08:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6507fa9ef630686f51860428bb0fe57f SHA-1: 96da079e3a918d05318655b6aaf78f54f64e3fc1 SHA-256: d488517d9164eb4f4e41e306165490d8fc719ce1746de96a87610e112858ea1a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

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://xezojetit.ru/wix?keyword=jbl+studio+590+vs+klipsch+rp-280f
    • http://copyrightsupportforlnstagram.com/volokurivaxiwuzix5tsx.pdf
    • http://sedovarubabozop.iblogger.org/39089658102.pdf
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/tepovob.pdf
    • http://xejevojesinil.22web.org/tokogumifaloxiwute.pdf
    • http://peskomment.ru/jojisibexujm6jf.pdf
    • https://kegewibenufugix.weebly.com/uploads/1/3/2/6/132682471/1553230.pdf
    • https://butapakenora.weebly.com/uploads/1/3/1/8/131871909/dfb5cd44fe0.pdf
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/difilowo.pdf
    • https://cdn-cms.f-static.net/uploads/4458618/normal_603301fd7f363.pdf
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5fd861792d5b8.pdf
    • https://cdn-cms.f-static.net/uploads/4382196/normal_5fd111e6e57fc.pdf
    • http://mp4.design/rekebedosajolezazorek8dunx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xinabugesan.rf.gd/lipitor_davis_drug.pdf
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_4b0a999838284e05a5f888b655738956.pdf?index=true
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_aa29a4d53c02495b97964c41082a24fc.pdf?index=true
    • http://kudelonibuwulaj.rf.gd/anne_marie_slaughter_a_new_world_order.pdf
    • http://fewanepuwigox.epizy.com/26047620948.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_off0001512c.bin
72fae6062b7d27f39d4eab31edcc9ca55f4a6e31ed268589b9ed0cd06d0f1e43
pdf-font-stream PDF embedded font (sfnt) at offset 0x1512C 6064 bytes
font_01_sfnt_off000165d5.bin
37acb95b5aa99be998740a71cac02c6892dbb086199e38dfd566be39d9873aba
pdf-font-stream PDF embedded font (sfnt) at offset 0x165D5 11304 bytes