Malicious PDF — malware analysis report

Static analysis result for SHA-256 41efed11ed3e78e4…

MALICIOUS

PDF

78.2 KB Created: 2021-01-07 01:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c22419893c58632335dbbe7a80f87814 SHA-1: 0ff726619d7b3819da1823b8588c11532773791d SHA-256: 41efed11ed3e78e4248f63e37f60279b4234160ad335ce9b1ddd7dcbfbb68023
156 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 0.9998

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://trafficel.ru/123?utm_term=ph+food+chart+pdf PDF link annotation
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/91c4bbff90.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/eLOhjii/16813831964.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/i3xhicR/nukozugukoraxulubefom.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuneduzib/5jolgeL/65816456624.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/7904096.pdfIn PDF document text
    • https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/2787d8b1fc6071.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/zusolaviwekamax.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/iixejsq/47490856468.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/Ihciehb/best_online_shooter_games_ps4_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/1hbWK49/6209897744.pdfIn PDF document text
    • https://cdn.sqhk.co/fekuseguxe/tgdbphe/rovozufogojevisajabut.pdfIn PDF document text
    • https://cdn.sqhk.co/nunologen/Aidb7x7/grand_street_racing_tour_gsrt_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/0B4PxxR/last_remaining_survivor_of_ww1.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/waxegatulo/70487407359.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 5032 bytes
SHA-256: d4ee30a3eb8b8e23f300fb11221b80111c4163347a22ca3881141f874fc5490d
font_01_sfnt_off00010850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 10536 bytes
SHA-256: 56b7157ef882379b8b2b42abbcec27a47bf0e559b379c307ff287b8b5ba6d749

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