Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4cbdf34ca2a77a…

MALICIOUS

PDF

87.6 KB Created: 2021-06-10 08:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3c3da2307e15359ae2da3bc270a7c6bb SHA-1: 8033afa096024acfca141e403059d30dec866919 SHA-256: fd4cbdf34ca2a77aafd6e101a8031d4e9d350070b797133041f1a030d6abc4e5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL suggesting a lure related to an air fryer manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=air+fryer+mondial+premium+manual PDF link annotation
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/wokuxuwitevinimid.pdfIn PDF document text
    • https://punafatig.weebly.com/uploads/1/3/1/4/131408139/946d0e9e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_60300861e40da.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/lezogevizaku_gojipefi.pdfIn PDF document text
    • https://puzapageduz.weebly.com/uploads/1/3/1/4/131453954/66f0127fa.pdfIn PDF document text
    • https://mabatuba.weebly.com/uploads/1/3/5/3/135303696/puled-lebebuwavixul-larogizulize-zuzufol.pdfIn PDF document text
    • https://kumigovujubexug.weebly.com/uploads/1/3/0/7/130776874/6a1419d66793ff.pdfIn PDF document text
    • https://jozemaxeg.weebly.com/uploads/1/3/0/9/130969614/84d76.pdfIn PDF document text
    • https://zidodorisud.weebly.com/uploads/1/3/4/3/134305305/voxujomoziva-vonisivuv-poxijol-dawibowalenobu.pdfIn PDF document text
    • https://jikunuxot.weebly.com/uploads/1/3/4/3/134315974/daworowak_zenina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_606c29f9ea648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_602caf5eeaeb9.pdfIn PDF document text
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/7606465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450907/normal_5fcb3fd878245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449600/normal_5ffd465b82be7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wilimonozak.pbworks.com/w/file/fetch/144841422/gokanesixu.pdfIn PDF document text
    • http://pimepovume.pbworks.com/f/15154211449.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144535827/pabekowowoded.pdfIn PDF document text
    • http://tereburokofe.pbworks.com/f/84193161150.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/w/file/fetch/144648021/42377635481.pdfIn PDF document text
    • http://sovamexor.pbworks.com/f/39128269448.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_off00011241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 5100 bytes
SHA-256: 37c02c03c0aca11379680e45cd831372895dead0f0450498f8e0b1a7354c15d8
font_01_sfnt_off0001238e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 14180 bytes
SHA-256: 55a5e7d5831f65519dbd6aec9f7e6bd26376e00c016f16ba0381d784fe3975b5