Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8548dd04382a089…

MALICIOUS

PDF

77.5 KB Created: 2021-03-23 01:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a72a3e10f11b27a345548f78667de023 SHA-1: 5e08afce7165b6cb7ffb844fef674ca7062314fd SHA-256: c8548dd04382a089fc688af185491f9c0451f81a7fe9fca5989d100f4ae93a98
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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/award?keyword=acetoacetic+ester+synthesis+pdf PDF link annotation
    • http://gazupoz.sportsontheweb.net/download_adobe_reader_for_apple.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/hp_50g_advanced_users_reference_manual_edition_2.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/quenching_and_tempering.pdfIn PDF document text
    • http://pejelurim.getenjoyment.net/sidusupigoxuliga.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/banking_awareness_questions_and_answers_for_ibps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/how_to_get_osha_forklift_certification.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/91543060978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cb13d1-30a8-4e7e-96d0-22286e0c0179/61376068006.pdfIn PDF document text
    • http://fugewad.rf.gd/android_10_gestures_port.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_8ef4a7f51c8543c88d0ea8a25c1dfc36.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_13491e1cffba4920af1b39f950cf524a.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_730115fddd6946099cf4555df304f62e.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_394ad6f5b8a148b2b5bc37ef57d04425.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_b70adb5e34104fe49f5dcec8f7a869bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d76c61-00ed-474c-ab74-48fa237ec0e4/the_dark_tower_book_1_audiobook.pdfIn PDF document text
    • http://xejarejunap.rf.gd/emerald_green_arborvitae_care_guide.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_806b69c0021c4f76bb61d115da81f383.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_b4d19397a38d4497a6497942679420ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d18535-29c0-4b2c-a70e-2aee9c9c54cb/67565761141.pdfIn PDF document text
    • http://vaduxovogemuke.epizy.com/audio_recorder_and_editor_cracked_apk.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_968074480d604ae9880d973d9220893c.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_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 5300 bytes
SHA-256: 42b7ba9430ffbac302410d2f5b7d0a2dbd7f757b1eb24408d48538156579de2a
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 11264 bytes
SHA-256: df4f826ca2c43bf20efdf5dcc0e447da3a51afe40b8405387e9eada144dff904