Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b1b0fca3332d7f…

MALICIOUS

PDF

78.5 KB Created: 2021-04-02 12:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6989842091972009b0e07b2b79870e77 SHA-1: 27f48189f187064d4a7227bdc329df84d83726ee SHA-256: a6b1b0fca3332d7fc447df864916fe89b10d82412ca4ebd928eacb5ff4856f79
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=how+to+scan+negatives+epson+v550 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368488/normal_5fe59a0143c23.pdfIn PDF document text
    • https://degepuwenezeg.weebly.com/uploads/1/3/1/6/131607310/vamegisevakile-nupitilat-papelerewarakew-bugalezizutol.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/dell_precision_t5500_motherboard_form_factor.pdfIn PDF document text
    • https://varijiligedag.weebly.com/uploads/1/3/1/3/131383591/suvenapojezojuje.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/76272493951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_603bfbb3f1998.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/d96f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_6065ad024fe91.pdfIn PDF document text
    • https://muxuxinipizo.weebly.com/uploads/1/3/1/6/131637853/5949944.pdfIn PDF document text
    • http://xivekoto.medianewsonline.com/55245915943.pdfIn PDF document text
    • http://goguduve.iblogger.org/arithmetic_logical_reasoning_questions.pdfIn PDF document text
    • http://xomofaki.getenjoyment.net/5777783744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mitefarosut.rf.gd/wapuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2c180e-7003-427f-82d0-e3caad95de10/ritapasizeram.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/epilepsy_guideline_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf5367a-6bd3-425f-a0f4-7fa199c8538e/jetukubozumozetimas.pdfIn PDF document text
    • http://donixug.epizy.com/19919028710.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/motorola_mc40_hard_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95282bbe-81ef-4da1-b716-fe0fb94329d8/kubezuxelifivuburogaguse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdd7005-a36d-4dad-a566-b5f9fd6ce700/2350441916.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_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 5352 bytes
SHA-256: 178a5c58781ddf6803686c24cdf2897a1057d7d523f446b88fde1724282f71a7
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 12292 bytes
SHA-256: 4c6635ce69d6ff35543ead1337ff5c47b1def962d69a993c58301f1738bee772

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