Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8a91496c1eb500…

MALICIOUS

PDF

88.5 KB Created: 2021-02-13 13:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b30021f77a47fbf03fde2bf63f69c65b SHA-1: 16b0daa05cc68a5266f22f128bf8079fa3ed74fa SHA-256: be8a91496c1eb50069e58fcd76538f3f8400686d93b865cfe6b9253eda0baf8e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, suggesting a phishing or malware distribution lure. The presence of external URIs like 'https://seumenha.ru/123?utm_term=growling+grass+frog' further supports this, as these are likely entry points to malicious content.

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://seumenha.ru/123?utm_term=growling+grass+frog PDF link annotation
    • http://discount50.pro/automation_testing_tutorial_for_beginnerschdwz.pdfIn PDF document text
    • https://cdn.sqhk.co/lemusezilaz/cibM6ih/tiktok_ban_news_update.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/PThe8X8/bingo_cards_numbers_1_75.pdfIn PDF document text
    • http://kurekarer.22web.org/old_version_of_adobe_reader_8._0.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/jfGklhd/51131946021.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/dgdggEm/dragon_age_origins_redcliffe_village_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/idskniw/5305545256.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/hgdhf1M/kujetonomilipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://leguliwopubagu.epizy.com/happy_birthday_wishes_for_husband_video.pdfIn PDF document text
    • http://gulopajekojof.epizy.com/harry_potter_trivia_questions_and_answers_list.pdfIn PDF document text
    • http://nimunofat.epizy.com/13806549042.pdfIn PDF document text
    • http://veraleminawawix.epizy.com/valebakexumidonajafojevo.pdfIn PDF document text
    • http://wenumamugaru.epizy.com/74018112682.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_off00011e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 5056 bytes
SHA-256: 43c76ebb1b0806f76f392eeaf7306ece9fabfaada82d238212f0feb98b361af7
font_01_sfnt_off00012ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF6 11080 bytes
SHA-256: 7d0cfe33d6d143c591a055aecb11c876e5a7d161ec5142c35b1f9e9ba5b18dc8

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