Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d38de5f48ad848…

MALICIOUS

PDF

75.3 KB Created: 2021-03-08 07:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b31348132f5c0343e22dba5fc139c01 SHA-1: f11befb2b3c7bba6b63d3b6b31d5503b422410a9 SHA-256: 95d38de5f48ad848be09e8c2d012e1a5d6b1887dc8cc5ace99f658bc79efe17c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'seumenha.ru', suggesting it acts as a link farm to distribute further malicious content or phishing pages. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces the assessment of a malicious link distribution 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://seumenha.ru/wix?keyword=sims+mobile+apk+unlimited+money+latest+version PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413967/normal_5fedcf58027c2.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/fThiEjc/supposedly_meaning_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418590/normal_602519365ca68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_5fe9e17d93f20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455884/normal_603d700e17468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455176/normal_600f160a85017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414331/normal_60066013c1a06.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/pekisararazodakoza.pdfIn PDF document text
    • http://wokulorumal.iblogger.org/problem_solving_activities_for_elementary_students.pdfIn PDF document text
    • https://cdn.sqhk.co/rufigukuj/KgjKV3f/17199240735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_60119756c80a3.pdfIn PDF document text
    • https://cdn.sqhk.co/lazimafuxuxi/ifflMgc/esl_cs_go_player_rankings.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kadoxosin.atwebpages.com/nutrition_facts_on_sonic_vanilla_shake.pdfIn PDF document text
    • http://forolulazo.rf.gd/mofixopupunukexem.pdfIn PDF document text
    • http://xafafogaditeki.rf.gd/mind_over_matter_lyrics.pdfIn PDF document text
    • http://kedipijelabilum.rf.gd/tabapujokesesov.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_a6903c76832f4142a359a2ee1deeec07.pdf?index=trueIn PDF document text
    • http://wemitagokodunes.epizy.com/40643302405.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_5e25bcf9c20a455e91c063fcce1f84a6.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_51f9d86de66e478497838b6b46bec8b9.pdf?index=trueIn 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_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 5572 bytes
SHA-256: 11ebde9d173220875117e1173daf80d0d3707c026103dd1035b27e9b55d79d2c
font_01_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 9948 bytes
SHA-256: e71833df9beb726aeaf35fa85391865bf671c6058cd18caff3c926885b8d0adc

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