Malicious PDF — malware analysis report

Static analysis result for SHA-256 e985c23e2f768d88…

MALICIOUS

PDF

76.0 KB Created: 2021-03-14 12:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 69aebb95d36721f09236583d3e6d30ed SHA-1: a6f5518f8e6d5f39017dd142fd4729e4d0089f56 SHA-256: e985c23e2f768d881a295dddbec9c8dea6daa15d202d1737d3b6401ab6877262
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many of which point to disposable hosting or redirector infrastructure, suggesting a link farm designed to distribute malware or phish for credentials. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content for malicious purposes. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=basic+concepts+of+core+java+pdf In PDF document text
    • http://kavelizopepi.mywebcommunity.org/nidiluzurimu.pdfIn PDF document text
    • https://vowijavig.weebly.com/uploads/1/3/4/3/134319359/4827815.pdfIn PDF document text
    • https://suveruwifofe.weebly.com/uploads/1/3/1/3/131380558/zikugekujekegegojefi.pdfIn PDF document text
    • https://zotujovub.weebly.com/uploads/1/3/4/3/134354671/tuzakuve.pdfIn PDF document text
    • https://nezopubetuw.weebly.com/uploads/1/3/2/6/132681339/cd94f.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/33942158447.pdfIn PDF document text
    • https://sagudazotimoja.weebly.com/uploads/1/3/4/7/134753003/womekub.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/tuvuvowufixugixosamirite.pdfIn PDF document text
    • http://vowitufafuzebil.scienceontheweb.net/36662129253.pdfIn PDF document text
    • http://zuvufikeluzodi.iblogger.org/switch_diablo_edition_release_date.pdfIn PDF document text
    • https://mabatuba.weebly.com/uploads/1/3/5/3/135303696/bunisadarid-kasage-riwunubigo-sumifan.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/9534602.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/accd6ce7202228.pdfIn PDF document text
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/sarunufugor.pdfIn PDF document text
    • http://wefilevazobakeb.mypressonline.com/panasonic_kx-tga660_replacement_handset.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pedamodaw.onlinewebshop.net/canal_av_parcial.pdfIn PDF document text
    • http://vinodek.epizy.com/novonixupinufujajanutipil.pdfIn PDF document text
    • http://godutiliwaganos.rf.gd/ajooba_movie_all_video_song.pdfIn PDF document text
    • http://gituloropo.rf.gd/vosawumibixilis.pdfIn PDF document text
    • http://divifafapinuk.rf.gd/61701344544.pdfIn PDF document text
    • http://dunoxoxuri.epizy.com/78140887619.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/rcm_business_plan_book.pdfIn PDF document text
    • http://pezududofafoguv.rf.gd/99508825320.pdfIn PDF document text
    • http://beduxidav.epizy.com/96329610504.pdfIn PDF document text
    • http://sibijexobesu.epizy.com/70802395023.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_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 5300 bytes
SHA-256: 364279a6aa581c696f32267bb1fdbe030c87641b4ab3a50134ce001f5c949545
font_01_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 11372 bytes
SHA-256: 1cb3bbb266d200195d673672ab219d2313e95e98a708d4c294a23c82ef506376

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