Malicious PDF — malware analysis report

Static analysis result for SHA-256 172759fbbbc3218d…

MALICIOUS

PDF

71.5 KB Created: 2021-02-21 17:44:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9086a5a3923dbfef2343abaabb41eda6 SHA-1: 21a5cee71992a268c7c451fd110c97a29f9fce0b SHA-256: 172759fbbbc3218d61cf7135aceec62a9415e27fcb776efdbdde7ecf6e3ecf10
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though truncated, suggests a lure related to 'worksheet answers', aiming to trick users into clicking malicious links.

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://bologen.ru/wix?keyword=ionic+and+covalent+naming+worksheet+answers PDF link annotation
    • https://jufapagemegugux.weebly.com/uploads/1/3/4/8/134860181/3258373.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/buxojozafoguvaposafo.pdfIn PDF document text
    • https://cdn.sqhk.co/siwemawatu/gODichf/nileditusaraligudumonisu.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/iachifz/xibupivolu.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/dFiGBhf/kodi_titanium_build_live_tv.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/pabeguzakurop_tabasuxon.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/5436763.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/fie0e2o/centris_federal_credit_union_payoff_phone_number.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/furijinibef_mofefosodo.pdfIn PDF document text
    • https://cdn.sqhk.co/naxenunovus/3iiihU6/woodcutting_osrs_quests.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/h2yifDt/wordscapes_cheat_level_6001.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/jaNJoge/85437982925.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/gedesisumi/xetadusigus.pdfIn PDF document text
    • http://baverasoge.epizy.com/mawojidumixu.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/46009482715.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/online_movies_free_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/password_file_for_brute_force_attack.pdfIn PDF document text
    • http://gurevome.rf.gd/catia_solidworks_free.pdfIn PDF document text
    • http://tukemujixoku.rf.gd/ravabudevaduz.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_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 5508 bytes
SHA-256: 2f57af76d1166471188d03edde7b5ac412510fb8f764ea93ea139c674f093f50
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 10012 bytes
SHA-256: e369f3a179bf284a75df9904495d1310116bf89a76d7c32d7057318b2bc49469

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