Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22eeb5d5a8e4cb7…

MALICIOUS

PDF

71.1 KB Created: 2021-02-15 17:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b2b542d899313dac5db40e9652499e1a SHA-1: 65a9d24268cc375bbfe064421bc2ac00ccfef235 SHA-256: a22eeb5d5a8e4cb7ebe5207ecfd2aab3c3ec79a325393a7371ab2a327940ddc3
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm structure points towards a malicious document designed to redirect users to potentially harmful sites.

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://leonvi.ru/123?utm_term=is+there+a+new+outlander+book+yet PDF link annotation
    • https://cdn.sqhk.co/xelajuwodaf/cgjCgc5/tower_keepers_gathering_storm.pdfIn PDF document text
    • http://5gusevshop.space/wwe_mayhem_app_cheatsn4b7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_6019050e89d92.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/xqPOJgd/61392111218.pdfIn PDF document text
    • http://naturfresh.fun/91446819385af9d.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/gjnOWcY/titan_ionian_island_paradise.pdfIn PDF document text
    • http://stal-kemerovo.ru/pression_osmotique_exercicewwx78.pdfIn PDF document text
    • http://kersita.space/75627180007x4kkn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dabemekos.epizy.com/99988351541.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/bt_sports_tv_guide_tomorrow.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/14019328852.pdfIn PDF document text
    • http://zokitidekav.epizy.com/glory_betting_tips_vip_apk.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_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 5248 bytes
SHA-256: 83bb2fa6e35663a859566355c6f5b256a6fe0ac2facd5edf36dc3c5170646098
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 10524 bytes
SHA-256: 9fbe268960d51d59d3fe83bdee15131eb983661c938461c50c3aa5075a754dcf

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