Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67e470473e479dd…

MALICIOUS

PDF

90.9 KB Created: 2021-02-27 19:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c8ea102e2163c5bd044df9a7ce0c18db SHA-1: a6337dc82505f751e6fc4796f9f1453500fb88c8 SHA-256: a67e470473e479ddcda2a6f2371449ca473b336b3cf9e735d51059bdbbd6dd39
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 an embedded URI pointing to 'bologen.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to salary information, aiming to trick users into clicking the malicious link.

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/strik?utm_term=how+much+do+social+workers+in+australia+earn PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422897/normal_5fed6471e5cc9.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/wojazowabotoviwebugun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_5fd3a3d432ad3.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/podus.pdfIn PDF document text
    • http://solavopuna.22web.org/wowhead_jaina_mythic_guide.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/ikemen_sengoku_nobunagarycc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389101/normal_5ffaa59a11be3.pdfIn PDF document text
    • http://dakujuzoma.22web.org/96528602980.pdfIn PDF document text
    • http://zekoselu.22web.org/alan_wake_soundtrack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevesijuduma.atwebpages.com/20709603045.pdfIn PDF document text
    • http://wetovokerug.epizy.com/rockstar_full_movie_123mkv.pdfIn PDF document text
    • http://rofizamomu.rf.gd/gudang_lagu_123_mp4.pdfIn PDF document text
    • http://pafovipazatuk.rf.gd/72096950770.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_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 5296 bytes
SHA-256: b42064e87612a30d6e23f184fca1d55acf33b43c393eb1c6ebeccbee7b0fefce
font_01_sfnt_off00013970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13970 10856 bytes
SHA-256: 5b45c36f39a357568235e48e177fb87a7e0af88fc4434e31f7e7b7deee2003a7

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