Malicious PDF — malware analysis report

Static analysis result for SHA-256 819e18089cd28e60…

MALICIOUS

PDF

79.2 KB Created: 2021-03-04 00:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 920395ca09e767c7634cda12268d3437 SHA-1: 8493f7774ab5cb4922f584c523f8d1cd0a2535c5 SHA-256: 819e18089cd28e60557d22a9be776a087d7e199fb5e4c4757119563c093cb2bc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the heuristics point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=quotes+mental+toughness+in+sports PDF link annotation
    • https://cdn.sqhk.co/rowubuvuke/1jftibQ/biminopujulifoxevi.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/icZjf3x/elite_hockey_camp_2019.pdfIn PDF document text
    • https://puviguwa.weebly.com/uploads/1/3/0/7/130776677/4920818.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/rememisirevo.pdfIn PDF document text
    • https://gepogixuzusesil.weebly.com/uploads/1/3/3/9/133999736/vitixevet.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/kdjgMhf/boo_app_online_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/ohgidhh/24357003906.pdfIn PDF document text
    • https://torudedo.weebly.com/uploads/1/3/4/3/134352944/nokasoludijime-bivuxifixeworuj.pdfIn PDF document text
    • https://cdn.sqhk.co/zavilisuga/bv0gjap/40371925942.pdfIn PDF document text
    • https://cdn.sqhk.co/gesuxafom/ehiixsy/safipesenupasu.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/vulukusinameju_lovisipuzog.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/0k9jbMq/cross_stitch_fabric_calculator.pdfIn PDF document text
    • https://rosexanovetaw.weebly.com/uploads/1/3/0/8/130814227/rilawokuxovexaku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444623/normal_5fe545e215094.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/waloja.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/xulibebuk.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/eBicfhg/switch_rpg_games_2021.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/6845164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fd37ced3346a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 5296 bytes
SHA-256: 01dc36250d05f3eb5221c347d9d7d0013ea96dbc702877da5427d501285a8bc7
font_01_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 10148 bytes
SHA-256: cdd094a5415549579376be8f3033094aae0b6461c12446d6d6d7a5d80c0e844d

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