Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b313f5ae268aec7…

MALICIOUS

PDF

78.5 KB Created: 2021-03-17 08:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a8f8de0c8301af7e2332919dfc27a6a SHA-1: 5118d601dc749560c31ec6ff376fc180c994e54a SHA-256: 7b313f5ae268aec7996e6327377d809d928c4f2b0ba3d16c483ebabbfe3c0d25
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with at least one, 'https://vilenefex.ru/123?utm_term=facebook+messenger+active+now+turn+off+android', appearing to be part of a phishing or scam campaign. The presence of many links on disposable hosting further supports a malicious distribution or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/123?utm_term=facebook+messenger+active+now+turn+off+android
    • http://sputnews.com/how_to_use_ultra_eliminex_detox_drinkg19ws.pdf
    • http://atomlinux.com/nintendo_switch_operations_manualj39px.pdf
    • https://cdn-cms.f-static.net/uploads/4455658/normal_5fe710ee8784b.pdf
    • http://trysucre.pro/how_long_does_it_take_to_learn_algorithmic_trading7hbvt.pdf
    • http://reduslim-sito.site/zibudelagenazotowiiz8ry.pdf
    • http://azorocheat5.xyz/disney_garmin_vivofit_jr_2_waterproof1plco.pdf
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5ff05c8ab4bf8.pdf
    • http://pro-konditer.com/77858635158mq4dp.pdf
    • https://cdn-cms.f-static.net/uploads/4458163/normal_5fd286d9c3d09.pdf
    • http://gouliwer.online/birthday_cake_image_with_name_and_photo_editzxq8w.pdf
    • http://stebsmeh.space/total_warhammer_norsca_guide7xv4u.pdf
    • http://idealica-italiaofficial.site/56580908310y7ue1.pdf
    • https://cdn-cms.f-static.net/uploads/4417830/normal_60230f687cc66.pdf
    • http://pravagims.net/252037202346mg5j.pdf
    • http://bt-management.website/androrat_apk_xdanvnu4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pibagejebex.epizy.com/2019_fantasy_football_cheat_sheet_standard.pdf
    • http://zazoruwokabaj.rf.gd/2020_calendar_telugu_festivals.pdf
    • http://pebuvika.rf.gd/52934183653.pdf
    • http://bopufadepop.epizy.com/beperuli.pdf
    • http://lekamidoku.epizy.com/how_to_become_an_emt_paramedic_in_texas.pdf
    • http://rimalapotozuf.epizy.com/82933740260.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f338.bin
e75b462ca4d8555bc2c1b565186942914ec815a58fc430aa180a0dd5b3332788		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 5620 bytes
font_01_sfnt_off00010653.bin
d671f6b4b2f9be852a67d3ef83809c8d66365f024c644b26e7ed96311ad9a038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 11228 bytes

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