Malicious PDF — malware analysis report

Static analysis result for SHA-256 347a651c8e13fcb5…

MALICIOUS

PDF

79.1 KB Created: 2021-04-12 04:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2fd57de75d08edab1157ea6670e69279 SHA-1: 7a177468ba921d54663a3e32f63c95866f1a1a37 SHA-256: 347a651c8e13fcb506edb0aac4bb84e2ba76f8be2a7f5dc19cf0ae2b1be6db7d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains text related to mail forwarding, suggesting a lure to trick users into visiting the malicious URLs.

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://golowaki.ru/strik?utm_term=can+usps+forward+mail+internationally PDF link annotation
    • http://wapividazofar.scienceontheweb.net/wuwewomijufixabitam.pdfIn PDF document text
    • https://cdn.sqhk.co/pipagalax/iaIJhiS/71843259759.pdfIn PDF document text
    • http://firstsecu-paypal.com/ketawenepegokutiwafeegdyt.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/articles_grammar_exercises_with_answers.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/9933127245.pdfIn PDF document text
    • http://kukushpa.fun/faxunipiwoe46.pdfIn PDF document text
    • http://kimidenexikox.getenjoyment.net/gasal.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/jfFjgnx/piano_tiles_4_magic_tiles_go_2020_descargar.pdfIn PDF document text
    • http://katermore.ru/garmin_approach_s60_troubleshootingo3z7i.pdfIn PDF document text
    • http://nawitebexu.medianewsonline.com/basic_electronics_theory_with_projects_and_experiments.pdfIn PDF document text
    • https://cdn.sqhk.co/zimevegi/iasMuif/safonetujodixovur.pdfIn PDF document text
    • http://naturagrush.space/mugujabivixemugwqi8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_a8753bcf96d841f397b2ab01534eed45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f83b0c7-4fb6-48e8-a596-9d818142f2d4/best_second_hand_car_buying_app.pdfIn PDF document text
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_92d12d0bec414b678e7c110bdefac8bb.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_37860e803810443b97a9a3e43172ec6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1dea393-b560-4ca1-8798-9f67199ecc75/what_does_patriotism_mean_in_advertising.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/como_aprender_ingles_facil_y_rapido.pdfIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_b73c03d430f44ec59511c0e92b5e8933.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb661f5f-0c66-4644-8109-c1723f210e47/44692217513.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_0bd2e67eb7d54953a1fe99d853bdad9d.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_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 5284 bytes
SHA-256: 7f859043cc46bcfcd6f181d2c2d71e426dc60dd04eb4a910b90d946ac61ea8b2
font_01_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 10808 bytes
SHA-256: 755bcff8593e7f70c20ac0384d0bae40b217e26ca523f3cb9e0666f0ce979e87

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