Malicious PDF — malware analysis report

Static analysis result for SHA-256 76010b80308db8b8…

MALICIOUS

PDF

73.1 KB Created: 2021-02-24 14:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1023ee8c1c68c5b671928473e3a15821 SHA-1: 301894dbf02e5e50d987804fdc62d5a4958428fe SHA-256: 76010b80308db8b86c14957fb26da95a8429ccf5ce289038b19649b2ac4842ed
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many pointing to disposable hosting or redirectors, suggesting a link farm used for phishing or malware distribution. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wix?keyword=imf+practice+worksheet In PDF document text
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/jigivamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_601e98057b6cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475738/normal_5febdb25e230f.pdfIn PDF document text
    • http://fofafowazu.66ghz.com/aashiqui_movie_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491925/normal_600727d7cbd83.pdfIn PDF document text
    • https://mozakemu.weebly.com/uploads/1/3/0/7/130738716/janunemopo.pdfIn PDF document text
    • https://pizanege.weebly.com/uploads/1/3/5/3/135391653/wuvazewarukol_tuvemesidaleg_vidipodas.pdfIn PDF document text
    • http://maroron.22web.org/jibon.pdfIn PDF document text
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/6639856.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/jfUihBd/cobra_snake_3d_view.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/39100227f.pdfIn PDF document text
    • http://sebaxupakokak.22web.org/zisalirivagigebunasodigaw.pdfIn PDF document text
    • http://tufevasataj.iblogger.org/final_franchise_tax_report_arkansas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewivifonawati.epizy.com/84609861752.pdfIn PDF document text
    • http://rolaxaja.rf.gd/11315658117.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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 5316 bytes
SHA-256: df08a18b8884c16f1328bf97a6616d47a8f5cbb09be68697abeb766f1d2b84bc
font_01_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 10420 bytes
SHA-256: 0a3ec54c48796ebc417dfe1b85ba36e17ded3af40f13ebd73def83d0180e846f

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