Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7113f12ff68f13…

MALICIOUS

PDF

78.2 KB Created: 2021-02-14 08:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c9d3169da86d8610cd91d6f9feca342a SHA-1: 4384fec52fa164749d799f3e2b050cfcd470518e SHA-256: 4e7113f12ff68f131718b1e482a88e437028b5f60f8514b50adf2bffd633bc38
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, with one prominent URL pointing to a link farm on disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect the user to external, potentially malicious, sites. The primary attack pattern involves using the document as a lure to drive traffic to these sites.

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://seumenha.ru/wix?keyword=what+are+some+good+bets+to+make+with+your+girlfriend PDF link annotation
    • https://cdn.sqhk.co/kunimanujage/9jhwifE/2029691803.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/idhjj7l/ganizokonalemutiwinut.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/jj0Lhd2/amaze_file_manager_full_apk.pdfIn PDF document text
    • https://sizasoko.weebly.com/uploads/1/3/1/3/131384227/2426906.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/jimx9je/vokolizuwesejuvoj.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/5783771.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/hdEgi2a/ninja_dash_mod_apk_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xogetusutu.rf.gd/5136978609.pdfIn PDF document text
    • http://duwagisu.epizy.com/centrelink_online_reporting_times.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/pixalizuvigise.pdfIn PDF document text
    • http://poxizigifami.epizy.com/gndu_date_sheet_2018_ba_3_sem.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/38594368123.pdfIn PDF document text
    • http://tuvufuxo.epizy.com/90572027613.pdfIn PDF document text
    • http://jaxovisujopav.rf.gd/jaloxuv.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/barney_and_friends_full_episodes_free.pdfIn PDF document text
    • http://mitudosukekunif.epizy.com/gisatajafajonozike.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_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 5732 bytes
SHA-256: 5fab7ac8d76135f467dac0942a9c89f88de4ac9aed594c8d6b82639f32a9d056
font_01_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 10172 bytes
SHA-256: 57c02f30ef60c79c3a60f6bda2976b7f1f47973e430f35292cd4eee4a9dc8431

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