Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07ba705fc8610b5…

MALICIOUS

PDF

73.9 KB Created: 2021-06-02 20:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7fd872f2e5ab72498486425d40e014f2 SHA-1: a87f664dfb13d1a514f99af1bbe7ba695966e9b0 SHA-256: c07ba705fc8610b57329209fb196f1c98d80bca9ecb77378f95cea916095e247
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 external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The document body, though heavily obfuscated, suggests a lure related to a 'Revention pos user manual'. No scripts were extracted, but the presence of multiple external links points towards a phishing or malware distribution attempt.

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://drafthe.ru/pbw?utm_term=revention+pos+user+manual PDF link annotation
    • https://pivikupawo.weebly.com/uploads/1/3/4/3/134356995/6559501.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/dagofemasenusovu.pdfIn PDF document text
    • https://xuloxaxofe.weebly.com/uploads/1/3/5/2/135294954/f2176.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/sotujar.pdfIn PDF document text
    • https://jopuwijexanubuf.weebly.com/uploads/1/3/0/8/130874501/kabiruzam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_5fda3884c04ba.pdfIn PDF document text
    • https://xukaxibuban.weebly.com/uploads/1/3/4/7/134701669/tepezix-gevamemes.pdfIn PDF document text
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/1794258.pdfIn PDF document text
    • https://pijefezumiw.weebly.com/uploads/1/3/1/3/131379255/dixuj-bexev-sesekojigibexev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485930/normal_5ff492f3cc0a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://silasofinat.pbworks.com/w/file/fetch/144477030/11493107360.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412488/que_es_el_lider_autocrtico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b382ddd4-00cb-417b-9a34-f7d8d01ea9a8/phonemic_awareness_games_for_preschoolers.pdfIn PDF document text
    • http://sikovifif.pbworks.com/w/file/fetch/144473292/conjunctions_worksheets_for_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1131dda-9f90-43e0-a314-33a5fedb3bee/introduction_to_derivatives_and_risk_management_10th_edition_by_chance_and_brooks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dcf5229-f3bc-4bb6-8bce-a383fdc624f7/57101596220.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/cities_skylines_traffic_mods_download.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144512097/rowetamipebatiwobubi.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144422373/how_long_it_takes_for_tadpoles_to_turn_into_frogs.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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 5032 bytes
SHA-256: 7d9e7ff771f90964b9d73569982f91e3769f5d98024b8521281e992db092a521
font_01_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 11084 bytes
SHA-256: 5a1735a9bc3999949205891f9bed12355ecb444c9efe10085894b50e32aaf351

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