Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b610b5526f9e0c…

MALICIOUS

PDF

89.6 KB Created: 2021-02-11 10:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9ddcde1d1c512a9e0aba09f97c6719b9 SHA-1: 013d543b25696d461f40dc776494770b25503f4c SHA-256: d0b610b5526f9e0c5cd0b141fb3de9608cfd78581f366bc9e3455a99e733c16d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Brideshead Revisited' and wkhtmltopdf, indicating a potential lure to disguise malicious links.

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://jacksth.ru/aws?utm_term=brideshead+revisited+movie PDF link annotation
    • https://radetotoko.weebly.com/uploads/1/3/4/6/134697609/voworageb_fopozorixuto.pdfIn PDF document text
    • http://photoforce.ru/37372673528kkfwo.pdfIn PDF document text
    • https://wesuzekubiw.weebly.com/uploads/1/3/1/6/131607103/9036528.pdfIn PDF document text
    • https://zotadapavera.weebly.com/uploads/1/3/4/4/134483721/gurokebojigod.pdfIn PDF document text
    • http://life-news.tech/90676606065at4ev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_60131997b7fab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374699/normal_5ff8fb3575097.pdfIn PDF document text
    • http://blablablacar.online/kegefavem612ny.pdfIn PDF document text
    • http://proflist-briansk.ru/lapuvusis0axc.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/gtE5D5I/tawusodetasorekezenavur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460060/normal_6001e81969d5d.pdfIn PDF document text
    • http://zovanatul.iblogger.org/ultrasound_guided_lateral_cutaneous_nerve_of_thigh.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/jicMgia/65396268717.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fcb1e23d9e75.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/W9haNkQ/wapenogukulijej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://matefurixexa.epizy.com/datuluviji.pdfIn PDF document text
    • http://sagisat.rf.gd/kaththi_sandai_bgm_music.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_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 5140 bytes
SHA-256: f5226404ea97fa7a9aa30953cc5f9d5c08c21c27e26b25862648c8e7779cb7f8
font_01_sfnt_off000131de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DE 11944 bytes
SHA-256: 7470a89c3fec49e9d5c313bc95b13114eb1ab956e162ff08ca1606b45dc595fe

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