Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3fca55a89afb67…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 17:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 74c4e55da5fdeb4c4c283abf4cf659df SHA-1: 781d1b46b07031aa50b2af986fa30f33173f23ef SHA-256: ea3fca55a89afb67c6f3e141a9b8d96e7266bc747083bcf60770b205932a612d
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=motsepe+foundation+bursary+2020+pdf In PDF document text
    • http://qrastenmap.online/464404552778s3ic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457332/normal_60283f24d5994.pdfIn PDF document text
    • http://normal-id.com/the_tyranny_of_merit_book_depositoryl3qzh.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/Vhdwgdj/28625436110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_5fdc37d24c3cc.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/Fjaxk4Y/low_cost_airlines_flying_to_egypt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_60449737741b2.pdfIn PDF document text
    • http://uspex22.online/exercises_to_strengthen_ac_joint_in_shoulderyou6q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_5fe73f568037c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_60142c800de58.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/the_secret_dare_to_dream_plot_summary9zhqy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_94de616ea72146caac97816c14ccba55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28c7457-24bc-4a9d-9b53-33420430313c/1968_evinrude_18hp_fastwin_parts.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_1b2c92dfbb88482f86d154e80acb2272.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/paxipugagetipen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883efc59-8182-451f-b16d-7ffe18dbbc99/toro_tmc-212_manual_de_uso_abreviado.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/26027883811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55690125-e5ee-4229-a3bb-99507dbe9da0/repetako.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_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 5524 bytes
SHA-256: ec45995616477a4dc43ff6f8b56eb9a8390a3bab81ff6deab8f362c0db493de9
font_01_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 11332 bytes
SHA-256: f949d52259283d70aa650a34c9f02d611b51f0b149dfdba9bf2c526aff71b08d

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