Malicious PDF — malware analysis report

Static analysis result for SHA-256 59dd7c8f66db98f0…

MALICIOUS

PDF

72.9 KB Created: 2021-02-25 16:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8c12bdf377ecc22f6a57d2067305f223 SHA-1: 4c2afa1322f7119e14039c781d4e5e7b43ddde17 SHA-256: 59dd7c8f66db98f051cc2ef6ed196870c75cec5b49697b8d4b06249bfffd22a5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable domains and employing UTM parameters, suggesting a phishing or link-farming scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of disposable hosting and redirectors, reinforcing the phishing lure.

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://seumenha.ru/strik?utm_term=britax+frontier+90+clicktight+expiration PDF link annotation
    • http://giocodigital.space/spartacus_all_episode_480pvq6xo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5ffd81e0efd58.pdfIn PDF document text
    • http://firstreadersclub.com/competitive_analysis_slide_templateu5dpj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_5fe7acfc802da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_601b04a0d8f37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413223/normal_5fec06f5a0592.pdfIn PDF document text
    • http://pagebake.com/the_emotionally_healthy_womaned9en.pdfIn PDF document text
    • https://pizugonuju.weebly.com/uploads/1/3/1/8/131856050/nonewebebukopujunis.pdfIn PDF document text
    • https://tizusetupo.weebly.com/uploads/1/3/1/6/131607013/085e6e63d.pdfIn PDF document text
    • https://gisixumaxen.weebly.com/uploads/1/3/1/8/131856636/1390668.pdfIn PDF document text
    • https://tesewipelevifiv.weebly.com/uploads/1/3/3/9/133997178/xexixejoweno.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/fumiposamisur/23687550361.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/what_are_the_duties_and_responsibilities_of_customer_service_officer.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/27465107236.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_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 5580 bytes
SHA-256: 646c1a0d673b3a2ec7ca2b88a260ac0602a4070fe3d224946865f6934807d191
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 10676 bytes
SHA-256: 0f9bcee96dda412346e0b75a1ba51a3072c8f4ad537173dbb85997e4f8a05320

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