Malicious PDF — malware analysis report

Static analysis result for SHA-256 188b0dd9df0d54f8…

MALICIOUS

PDF

72.3 KB Created: 2021-04-06 11:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f9f411cecde26f683efd855d6ad60b4 SHA-1: 7ca4ec020f86010ee63ef90ed66293224c462eb3 SHA-256: 188b0dd9df0d54f88885e0b0a5e0969eb5e4c1916824df11ad16656199419bcf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or SEO spam tactic. The embedded URLs point to various PDF files, likely intended to redirect users to malicious sites or phishing pages. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=nsk+super+precision+bearing+catalogue+pdf
    • https://cdn.sqhk.co/zuxosutuku/ibgiXha/olympic_compound_bow_distance.pdf
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/1605796.pdf
    • https://cdn.sqhk.co/lesasafo/2eUphbo/mastering_physics_answers_vectors.pdf
    • https://cdn.sqhk.co/gigijuke/9OfiaCY/28183157186.pdf
    • http://nubuxeki.scienceontheweb.net/78121543914.pdf
    • https://cdn.sqhk.co/ramidazumiko/digicrw/48254060376.pdf
    • https://cdn.sqhk.co/gigijuke/IFFijg7/fuxawogivemitajumawafuta.pdf
    • https://cdn.sqhk.co/vozaxodep/anWABfj/skywars_roblox_codes_for_coins.pdf
    • https://mopobaseburole.weebly.com/uploads/1/3/4/8/134859053/zojavuwupeso_bolipon_bivuzeket.pdf
    • https://cdn.sqhk.co/bapisolel/hggjqic/9019804653.pdf
    • https://cdn.sqhk.co/ruretibot/ifD7gfh/symbolism_cosmos_flower_meaning.pdf
    • https://cdn.sqhk.co/ninivaxibab/0HSjaab/nukegigome.pdf
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/dumesugawejafiwar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pivetuzadujo/puvonuduwowodunubirivuxi.pdf
    • https://uploads.strikinglycdn.com/files/7028e674-2a10-4ce5-8be5-8a4dcfec4403/23418875765.pdf
    • https://uploads.strikinglycdn.com/files/f8aa09c1-6afc-493f-bf59-eb7b38f2ee30/how_to_unjam_a_dewalt_finish_nailer.pdf
    • https://s3.amazonaws.com/vonusirukete/delivery_note_template.pdf
    • https://s3.amazonaws.com/babetafaperaxov/reliability_engineering_salary.pdf
    • https://s3.amazonaws.com/rozebofukixus/49119674788.pdf
    • http://fidikaxano.myartsonline.com/57886096497.pdf
    • https://s3.amazonaws.com/jofunozuzof/plague_inc_evolved_indir_apk.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_off0000db0f.bin
b8daf168b0476f18cbc6c15516c472be6b87f4cbe8b8658d9d342092e3d38490		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 5496 bytes
font_01_sfnt_off0000edd3.bin
a4fdf982cbedeea790d0527e84068ec7294111b3385922b69f6d174864be8c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 10716 bytes

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