Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e4b22b968e9247…

MALICIOUS

PDF

73.4 KB Created: 2021-02-24 00:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8a64c1bb9b2950ecd6e2199dd743fe8a SHA-1: 70475cae2a6783e0763a31db568f2971b78a9f10 SHA-256: 16e4b22b968e9247aa15ea2aa03801e0185f53c3ddf47577f9127cad76764dfb
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain associated with keyword-based redirection, suggesting a phishing or malware distribution lure. The PDF structure and embedded content are consistent with a link farm 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://jottigo.ru/wix?keyword=a+serbian+film+full+movie+english PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476936/normal_5fe1040b2e4ec.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/fhd5idN/paragliding_simulator_vr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469863/normal_5fcc05c5ec12c.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/iI0ghjh/tricky_traps_gioco_anni_80.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/ifXhfWi/xetofunamafi.pdfIn PDF document text
    • https://jonexizuli.weebly.com/uploads/1/3/4/2/134235370/bf92a402fea29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_600a5053d8967.pdfIn PDF document text
    • http://giocodigital.fun/tablas_de_centroides6o6jo.pdfIn PDF document text
    • http://weraka.online/559214423321khu9.pdfIn PDF document text
    • http://agentsoft.space/palitisitanexalolasuweqfwfw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423728/normal_6024f2a03dc4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5ff17047c4e44.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/pegek/circle_sticker_design_template.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/aiatsis_map.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/p600_auto_root.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/linfadenitis_mesenterica_en_nios.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_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 5372 bytes
SHA-256: 60960dffd6c1885a9a1c96e35b4fb70c65432f666a495da3f563cc0400abe09f
font_01_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 10424 bytes
SHA-256: 51ede0b035108f2b405f7b4e5c67f754227ce971abfbc22bbdfd07f283627908

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