Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4bf2af743b5cda…

MALICIOUS

PDF

99.4 KB Created: 2021-02-27 13:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 410fb26b77d84a3413357fba650885a9 SHA-1: 23788b7f3032e794005dd9346f9f9ea8c5c3d394 SHA-256: cc4bf2af743b5cda9df6909d727bcdf4f25641534102987c0f803a2fc510afd5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains, identified by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, aligning with spearphishing tactics.

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://xezojetit.ru/wix?keyword=bdo+trading+guide PDF link annotation
    • http://trellos.fun/tamilrockers_adanga_maru_movie_2018pgyxm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_5fd9159e79dac.pdfIn PDF document text
    • http://vodoroding.info/wavugamoribuwadilenaw2ul.pdfIn PDF document text
    • http://submonster.xyz/nevezijevajaxitaljoax1.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/TIifEhg/1836680255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_602299cc4dda2.pdfIn PDF document text
    • http://businessmentality.com/rokiniivmre.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/0hfX3sc/tewiwi.pdfIn PDF document text
    • http://save50it.info/bradesco_seguros_auto_funcionario_telefonezlyci.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390661/normal_600aaa6f5275d.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/9hbLDgg/dogwood_tree_images.pdfIn PDF document text
    • http://cosmicgig.com/goboxuzowobejogoducldce.pdfIn PDF document text
    • http://wowevopopof.22web.org/cancer_de_mama_en_mexico_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427085/normal_5fdd316128398.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/mha0ihd/59370096541.pdfIn PDF document text
    • http://outputqwvk.space/90119112879z4lk1.pdfIn PDF document text
    • http://doucheapp.xyz/the_expanse_season_5_all_episodesm233z.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/gwk25fz/jizedejodaxanototobeze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoruvalumupubi.rf.gd/epson_workforce_840_cannot_recognize_ink_cartridges.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_off00014080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14080 4832 bytes
SHA-256: 6b930ddd5544ba56b1eab879177f8733756abec84f352e49045fca404090af72
font_01_sfnt_off000150ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FF 15444 bytes
SHA-256: f14bcae75a04df80a049f4184d0dac3f3fee5c12e6881c02086099036fbea73a

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