Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c84534b887c79f…

MALICIOUS

PDF

79.9 KB Created: 2021-02-20 04:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 4deaa0bf2fb0e3f702910fa5e2b62a6a SHA-1: 3fa9ce130e5255a9b5852a45e3321eda854252b8 SHA-256: c3c84534b887c79f1c7a6092b21aad80e4bc776dbfab69a9515f7fa49933399b
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of multiple PDF links on disposable hosting 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
  • 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://jacksth.ru/wix?keyword=unc+medical+school+letters+of+recommendation PDF link annotation
    • https://cdn.sqhk.co/wixumenez/fxshaf1/loloxewilo.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/jgjbhhH/diamonds_imagine_dragons_traducao_whatever_it_takes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473890/normal_5fc5bf2e7b80b.pdfIn PDF document text
    • https://ziruxirunilexa.weebly.com/uploads/1/3/0/7/130775543/gufus.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/temiletis_fusofun.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/awk_printf_format_float.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/Jgcifgi/17264474893.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/MhhlVGI/tujufeguxaleja.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/0cce8c0e4.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/y5GtMic/25099783709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_60171f14371ce.pdfIn PDF document text
    • https://cdn.sqhk.co/dovewobojeb/bzjagfH/shoot_angry_zombies_java_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/C1geGvx/66890610829.pdfIn PDF document text
    • https://fepepifufom.weebly.com/uploads/1/3/1/8/131872298/pebajiketevu-mowajenuxeni.pdfIn PDF document text
    • https://gufulesem.weebly.com/uploads/1/3/4/6/134698375/sorogal-japikanagebu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gejopap.rf.gd/1364320304.pdfIn PDF document text
    • http://wedalavunobuwe.rf.gd/gravimetric_analysis_lab_report_discussion.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 5040 bytes
SHA-256: 9020891a2d73dc852f188916516781e3c7340acae242ccd5dc996ca8b956b8b8
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 9768 bytes
SHA-256: 524887a8a30c1b3a2b509152980ce3a56ef7b03d254f8b198b2e850d5f1b804f
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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