Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26db333a25dfeb2…

MALICIOUS

PDF

65.0 KB Created: 2020-11-18 08:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01d61bd7ec4d586bd7bcb74ef1e644d5 SHA-1: 1e7fb55198b87c102328e19fbe428e9bac3d3bf8 SHA-256: e26db333a25dfeb28e29bced2aa175cd82cc90cea43b7a4e80fca846f26e9ac4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on link farm domains, indicating a likely attempt to distribute malware or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful external content.

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://trafffi.ru/aws?utm_term=basketball+plays+template+powerpoint
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5f9464420b0f6.pdf
    • https://xerirexu.weebly.com/uploads/1/3/4/5/134592073/silimijubiviwinasat.pdf
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/wogov_wuvexalotez_disusexetoputud_dafomisosedasi.pdf
    • https://roromitekavu.weebly.com/uploads/1/3/4/5/134528712/pazekaloziwidimere.pdf
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/javipirefutofu_jixawawote.pdf
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/muxigadodivog.pdf
    • https://cdn-cms.f-static.net/uploads/4495043/normal_5fab968b03113.pdf
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/566736.pdf
    • https://cdn-cms.f-static.net/uploads/4421776/normal_5fa43ad518ca5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e1c99963-32d4-426c-be03-082de849f397/90062331962.pdf
    • https://uploads.strikinglycdn.com/files/25a7ac41-431b-476d-b6d1-fcad00e82224/lemaxurukulikevebi.pdf
    • https://uploads.strikinglycdn.com/files/d2ec7ff9-c04e-4a73-a1c3-f5fe5967bf76/formation_motard_police_nationale.pdf
    • https://uploads.strikinglycdn.com/files/9de5659e-41b8-470f-bb10-7b66d5729d41/want_u_back_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/7dd8e4e6-cc96-4720-8956-3e9c04315237/33137530135.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_off0000c153.bin
db55605fc510e3675b37606e68a875f662608c6f9708700765cf689009d2df11
pdf-font-stream PDF embedded font (sfnt) at offset 0xC153 5412 bytes
font_01_sfnt_off0000d3ba.bin
7a08f007f0c6f4f53be42c468e404773863a0f92cbaafd14487bf0339a431730
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BA 10368 bytes