Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce186063dd6b0b5…

MALICIOUS

PDF

73.5 KB Created: 2021-03-29 23:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3ee7b89eb43f4c5fc7d12386756e0fcb SHA-1: 218ff46240956b6d7b21ee1a25d54e759f3b1faf SHA-256: fce186063dd6b0b5d26d2e714dd66d421281d5154192cc720b90c55f332f16b3
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `https://dafemum.ru/strik?utm_term=catia+tutorial+video+download`. The document's structure and heuristic firings indicate it's designed as a link farm to distribute malicious content. No scripts were extracted, but the presence of malicious URLs and the ML classifier's high confidence score strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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/strik?utm_term=catia+tutorial+video+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_600c771c85eeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_5fe527f8e97d7.pdfIn PDF document text
    • http://fexavakagejil.iblogger.org/g_shock_ga-100l_5081.pdfIn PDF document text
    • http://potasofan.iblogger.org/audi_a4_2020_service_manual.pdfIn PDF document text
    • http://parkingtest.xyz/66106201005584jl.pdfIn PDF document text
    • https://ralifanexipoker.weebly.com/uploads/1/3/1/3/131380500/narul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5ff85d41a86ed.pdfIn PDF document text
    • http://nipodek.22web.org/causas_del_cancer_de_esofago.pdfIn PDF document text
    • http://magazok.top/how_to_find_taylor_series_of_ln_xpeseo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_603679722198a.pdfIn PDF document text
    • http://tejidetegowewi.iblogger.org/agony_aunt_problems.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5fdf464ccd502.pdfIn PDF document text
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/gifir.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/wamuwowuro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://junenizexi.epizy.com/stability_of_cycloalkanes.pdfIn PDF document text
    • http://finubovuputok.epizy.com/biomet_radial_head_replacement_technique_guide.pdfIn PDF document text
    • http://divapikej.rf.gd/how_to_learn_formulas_fast.pdfIn PDF document text
    • http://laboluvimaniraf.epizy.com/encyclopedia_britannica_2018_free.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_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 4696 bytes
SHA-256: ea80bc6cbb63f5a836dc1f3e145707cfc03cff415700d3fb7c6bc4cd86daaf2c
font_01_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 10652 bytes
SHA-256: 270dbed35917a7135d3f19239a16a42621eecfcbf4890d6f95428ef5423cbc3c

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