Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28a060f32fb380c…

MALICIOUS

PDF

77.5 KB Created: 2021-02-17 06:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 85db3f956503d2833f2cf1b13888447d SHA-1: 17e8bd4eabf88c78312eb6a79f5453f98eae432e SHA-256: a28a060f32fb380c3355af12fe4e87fedb7dd4017688fab461dc657e48bd1135
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=population+worksheet+middle+school PDF link annotation
    • https://cdn.sqhk.co/legusovej/vogiHyU/fireboy_watergirl_forest_temple_y8.pdfIn PDF document text
    • http://ijmalan.xyz/jipunuvurejujawavusufec2mf.pdfIn PDF document text
    • http://thefortykuti.com/vscode_python_format_pep8ql2ap.pdfIn PDF document text
    • http://repair-foto.ru/enjuq.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/fR3eahd/23545447426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_600aa68001f1b.pdfIn PDF document text
    • http://bodyita.space/daroladunefigetunenuf1b997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492574/normal_5ffa450fae3c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424361/normal_5ff144371a682.pdfIn PDF document text
    • http://walletelectrum.buzz/10623879511flwuq.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/hbighgZ/emergency_call_ringtone_download_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/iOjfhjs/photo_editor_software_online.pdfIn PDF document text
    • http://koolmaxt.online/maraxugapadedagatawusodjxvc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonabafat/20656583392.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_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 5468 bytes
SHA-256: 9099a706374492deb6e55d05459f8b8a469f55db9aefb81f77c3b36d266da5ac
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 10732 bytes
SHA-256: 5a66fe0aa91fc8fee4bcba7097c08b408510a153345c7073aa4ec550abf5097c

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