Malicious PDF — malware analysis report

Static analysis result for SHA-256 f106d8c60256b637…

MALICIOUS

PDF

75.3 KB Created: 2021-03-19 11:25:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1d2de94d19ed31ab24f64c07cf22c6ec SHA-1: 7e04e82b14bd21c0dee099bd071ddf5ac51f7fa6 SHA-256: f106d8c60256b6375108fc6d847b970f7262ca40ec49272073d10be97c4033d8
134 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 external links, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a social engineering attack aimed at tricking the user into downloading a payload.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/123?utm_term=format+of+ignou+assignment+front+page PDF link annotation
    • http://lunesygets.xyz/binomial_nomenclature_and_classification_worksheet_answersvcq6x.pdfIn PDF document text
    • http://freds.space/2453062315744hh0.pdfIn PDF document text
    • http://matroskin.space/whirlpool_refrigerator_ice_maker_removal2of85.pdfIn PDF document text
    • http://douchehq.xyz/family_feud_questions_for_married_coupleswfvrh.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/46946386257.pdfIn PDF document text
    • http://azorocheat1.xyz/31242545118955w8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_67db6b1ce5d844149a123655648fb8d4.pdf?index=trueIn PDF document text
    • http://busapow.rf.gd/fadap.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_3b2a449d5d4a481ead8aa9d43a0ce125.pdf?index=trueIn PDF document text
    • http://jabejanaboz.atwebpages.com/falukexefu.pdfIn PDF document text
    • http://gizexagivet.rf.gd/what_is_human_resource_management_explain_its_managerial_and_operative_functions.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_e705a411c31a426bb73ea2ad0a3792d5.pdf?index=trueIn PDF document text
    • http://sawotopedexorod.epizy.com/86079599114.pdfIn PDF document text
    • http://nufewaruxemo.epizy.com/are_all_bacillus_spore_formers.pdfIn PDF document text
    • http://luwaxilozaraxo.rf.gd/aptoide_pc_apk.pdfIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_4781ebfd27ec4ade97075fe1f3ded5aa.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_d7100cec0f0747d1895c9de04fe4e039.pdf?index=trueIn 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_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 5144 bytes
SHA-256: 046ad83a0262394642f947c037d4ed69a3d8a761e1c49124cd96df7d48b11752
font_01_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 10888 bytes
SHA-256: 7788927312cc0cefc8248e03f48c8f39c6cf42dd232356d9053cc2c5a84df430

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