Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b25e94959d27cc…

MALICIOUS

PDF

85.1 KB Created: 2021-03-23 20:59:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51e871916ae2dfe5e9cbda7bf254c222 SHA-1: 8401716629e391992c2d3920570898101348c6ee SHA-256: f3b25e94959d27cc8c5cfa0e20efe0457fc59c861f594e7f34a71215b30d6e35
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of an SEO poisoning or link farm scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=wrath+of+the+righteous+demon%2527s+heresy+pdf
    • http://molotkov.site/rock_band_harmonix_drum_set1hydp.pdf
    • http://trokot-tonirovka.online/13434838496wll1k.pdf
    • https://cdn.sqhk.co/kapimetavis/ZjgRhiJ/4498037960.pdf
    • http://pubavamamuzagur.iblogger.org/tubulufejatimopemojiji.pdf
    • http://oneplusonemain.xyz/unit_conversion_practice_keywht5n.pdf
    • https://cdn.sqhk.co/buzaxelubot/dgdiig0/74215919367.pdf
    • https://cdn.sqhk.co/noperizapewo/jhgjjhe/bewiladesaputukudubabo.pdf
    • http://afracheat9.xyz/what_was_the_brown_v_board_of_education_decisionhehdn.pdf
    • https://cdn.sqhk.co/sejujona/gjjit3y/xozowisegewo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/daraniwekamidir/73649318376.pdf
    • https://s3.amazonaws.com/pajukovuxetu/kibakonifikujum.pdf
    • http://jarewixefokoxem.epizy.com/leading_0_format_sql.pdf
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_910af13fe81247438bf9a745d70db4fc.pdf?index=true
    • http://zunepesojiwer.rf.gd/nelotaselazaredopi.pdf
    • https://s3.amazonaws.com/bipovoromoj/citizen_blue_angels_stopped_working.pdf
    • https://s3.amazonaws.com/sukobogixe/restrictive_cardiomyopathy_treatment_guidelines.pdf
    • https://s3.amazonaws.com/muvemasoxaji/tibexep.pdf
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_8094457f86a444b597833d0e31852bb4.pdf?index=true
    • https://s3.amazonaws.com/gomaxod/sigasowaginij.pdf
    • https://s3.amazonaws.com/defujo/memories_bring_back_memories_new_song_lyrics_meaning.pdf
    • https://s3.amazonaws.com/furunumaroxun/chrome_linux_kali.pdf
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_96b825baef9843f2ac15cc62e3ad9f98.pdf?index=true
    • https://s3.amazonaws.com/tigovatolis/redotoketakusegemuluru.pdf
    • http://mejadub.epizy.com/xejaruwawidomigede.pdf
    • https://s3.amazonaws.com/fizup/34349562561.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_off00010e6b.bin
b53e9417a90c185affcf4abac5502d7e1e1bdcd535b83376c66a9e561fcf573f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 5572 bytes
font_01_sfnt_off00012157.bin
81079a0d233230249a43809fa080d0906b6f04fbc997740820f74fa944c08edb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 10960 bytes

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