Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0596365257fa39…

MALICIOUS

PDF

76.5 KB Created: 2021-01-05 21:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 778e638d1a51efaff518bd8c6f8c8374 SHA-1: 765686b6b531497e0b5ea185ab39bff7945b1bbc SHA-256: af0596365257fa39c8f68c4d768d8c6f313183d5c8d358a39925825b6c16869c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafftec.ru/aws?utm_term=street+fighter+5+androidgamegratisan'. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized PDF. The ML classifier output of 0.999801 further supports its malicious nature.

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 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.
  • 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://trafftec.ru/aws?utm_term=street+fighter+5+androidgamegratisan PDF link annotation
    • https://mobefoba.weebly.com/uploads/1/3/0/7/130776725/napumarowagek.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/lupovufenisumevona.pdfIn PDF document text
    • https://cdn.sqhk.co/zagusebipin/dvb4nhc/wubujisogex.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/oggWDhv/241813477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_5fb82adb419ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/42c6d093-ec11-4783-9f5e-20e10d50fb4f/big_bang_theory_scientific_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa5a06a-4907-4dd4-958f-ea32d9fcadd2/dunkin_donuts_wake_up_wrap_carb_count.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9dbc98-a591-4cda-b491-ceec3cbe3752/anavar_for_sale_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/descargar_google_adsense_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e687b059-c8e8-43ed-9f4b-21380f54d7a5/rajisokozanawerusuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df09daad-4e62-4662-a89b-4936fbbfef63/wolf_of_wall_street_true_story_plane_crash.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 5516 bytes
SHA-256: 38638bac6fc3aff621565849caf6ecca94e46c8608e2ec76e57bd560c7f63ceb
font_01_sfnt_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 11076 bytes
SHA-256: 7c697ba4f5b39dfbf0e063553de47a25648bf1f19d5cc5ddba80197122cb0144
font_02_sfnt_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 18540 bytes
SHA-256: 4b42e7c6f790cda134c17672adf06f7c38b02466970146e614c49425722c95fc

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