Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cab46959476740…

MALICIOUS

PDF

69.3 KB Created: 2021-03-04 11:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3e92f0a77058d7bd5d63ee78832bfa80 SHA-1: cff479074e5f1dc6a5ffc40ea462b2ccd97ce7ca SHA-256: f7cab469594767404a4b3fd05a968ea850eeeb955ebed0afaebf51ee64549142
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farming or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/aws?utm_term=linear+algebra+by+david+c+lay+solutions+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377391/normal_602f573968399.pdfIn PDF document text
    • https://kidisizim.weebly.com/uploads/1/3/4/8/134899836/zafelowamere-lovix.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/vilotenera-veduk.pdfIn PDF document text
    • https://nakidero.weebly.com/uploads/1/3/4/5/134524904/5410168.pdfIn PDF document text
    • https://merasewutid.weebly.com/uploads/1/3/4/3/134348660/6566565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_6026ec169006d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_601c5bb4ee442.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489041/normal_5fde61f7d70fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_60225c839755a.pdfIn PDF document text
    • https://lipofodimeduwep.weebly.com/uploads/1/3/0/8/130813747/9f8ba41.pdfIn PDF document text
    • https://waxevinibiwe.weebly.com/uploads/1/3/0/9/130969944/8c35861faa42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_6033e6af4ef93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_600c876842903.pdfIn PDF document text
    • https://goxemuneb.weebly.com/uploads/1/3/4/7/134715014/povogivig.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/sojezudozenenoga.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/mosexanezesuf_movevaridikake_xobutavepuw_neginopimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_6024126e7bb66.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/luwewonovigopufoze.pdfIn PDF document text
    • https://levalezekavazif.weebly.com/uploads/1/3/4/6/134639406/bikedubap_repibuge_merozujomukisew_vafof.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/4446420.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/gobevif.pdfIn PDF document text
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/8387560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408009/normal_5ffcfc17c326f.pdfIn PDF document text
    • https://wovusowi.weebly.com/uploads/1/3/4/8/134886666/7806784.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ce66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE66 5716 bytes
SHA-256: 60662859c65ddfa7268933ed07a91d1b69477afff0acc36a0797a92afea320f4
font_01_sfnt_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 11088 bytes
SHA-256: 3feac1281d207c6191eb7b414fb066d92e9b9d9975fb77ae85422f549bf6f0df