Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdfb1f1eaeb4bf2…

MALICIOUS

PDF

72.0 KB Created: 2021-02-24 16:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5712dff8c7ebe14f4a9a21624ab0c775 SHA-1: 7a1dd858b01fa167a494d33b995d6bb3166a0003 SHA-256: bfdfb1f1eaeb4bf2201beeae714286935b7143251af487608bfab55194cca75c
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://yafferge.ru/wix?keyword=whack+games+unblocked In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477638/normal_6011f4463202b.pdfIn PDF document text
    • https://divekoworubu.weebly.com/uploads/1/3/4/0/134017674/mitogaben.pdfIn PDF document text
    • https://gibejuta.weebly.com/uploads/1/3/0/7/130776113/9803734.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/what_is_audacity_definition.pdfIn PDF document text
    • https://kopopoxewa.weebly.com/uploads/1/3/4/5/134597570/bopesip_mesaxabob_penilato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_6010ce635871f.pdfIn PDF document text
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/5da3033d5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5fdbd31242ab7.pdfIn PDF document text
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/573517.pdfIn PDF document text
    • https://safupoxex.weebly.com/uploads/1/3/2/6/132683070/4b76c10f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_5fe995bc3f079.pdfIn PDF document text
    • http://zelopaqq.xyz/889575525122d6a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490140/normal_602d0c94d6f15.pdfIn PDF document text
    • http://reduslimer.website/92577090952vd9sf.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/vigupugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_602a1d641ab03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livirava.atwebpages.com/perazujakevexerixedokosat.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/litezoxejelimu.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_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 5476 bytes
SHA-256: 00a2ed5c6fbe96a10b0ed39378be1d7560e40081f756e7360b1204557232ea01
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 10240 bytes
SHA-256: 98b155179667107a62096591447573662446b8f8810bc2d3ec27a42cd44a76ba

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