Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0acf7ac411e4053…

MALICIOUS

PDF

68.1 KB Created: 2021-04-07 11:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ca42524780ce3b6617d9685b3144dc11 SHA-1: 2d3758519967eab8249278b93d7ca0abea888c64 SHA-256: e0acf7ac411e4053d3d1e870dded2f43bcefea5e58e8b49fe5a89b1c1ca0fcbf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external URIs, with a primary suspicious URL being https://jumiwimov.ru/wix?keyword=chapter+6+vocabulary+practice+economics+answers. The document body, though heavily obfuscated, appears to be a lure related to economics vocabulary practice, intended to mask the malicious intent of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/wix?keyword=chapter+6+vocabulary+practice+economics+answers PDF link annotation
    • http://wedurorokim.mypressonline.com/fovododomimaxapefab.pdfIn PDF document text
    • http://logawedulukudan.mywebcommunity.org/encyclopedia_brown_book_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481418/normal_60058e5741f00.pdfIn PDF document text
    • http://dumigegin.medianewsonline.com/verifone_commander_topaz_training.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5feef959cee90.pdfIn PDF document text
    • http://gikafowezogupij.mywebcommunity.org/botogoxakare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_6054593b5629a.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/trigger_ancient_egypt_a_social_history.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/dgcjcPu/xomapur.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/gjbPhqY/raspberry_jam_recipe_with_liquid_pectin.pdfIn PDF document text
    • http://sefobadivura.iblogger.org/fojipap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_604ed377b16da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_604dcac9c00c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c39e97-e06f-483e-8b86-d425a2462009/brother_hl_2240_drum.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/super_mario_land_4_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/496b32b4-01e9-4819-b8f1-392e9fae4e0c/17600008362.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/54816380217.pdfIn PDF document text
    • http://gesubonepalit.epizy.com/identification_authentication_and_authorization.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/jorezataxa.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/vuranalalivesoridazi.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/what_is_the_responsibility_of_a_committee_chairperson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ad4234-87d6-44ec-a8e3-9ed31e9d4460/do_you_have_to_pay_for_twitch_prime_sub.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_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 5628 bytes
SHA-256: 09587e41adbecf93b0135396d38c5c1274fcbaa2f8ffd6d942f0be7bbb5c19b3
font_01_sfnt_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 10328 bytes
SHA-256: 53de92db2e09dad7b1365da4ca45934d7c9d76e19d0ab714fe3362b419154792

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