Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f9cc45bc8ea23b…

MALICIOUS

PDF

81.5 KB Created: 2021-02-16 13:42:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bda4e158c4a4a3210b7332897803ade3 SHA-1: da016e9049eabf7a47b2ce3c02245d9afaa164e1 SHA-256: 89f9cc45bc8ea23b3eb94e7e57c039957f210224f70b1c7e4228fc09c71d20e9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=how+computers+work+10th+edition+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449616/normal_5fd3cdcd7e505.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454429/normal_5fcef54a731d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_5fe8443ec287d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5ff427d48208b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403143/normal_5fe10d2fe0444.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/dOpMhjd/ascension_sky_dragon_tips.pdfIn PDF document text
    • https://zuramuvo.weebly.com/uploads/1/3/4/4/134480672/zagelozifovupa-kiwonunipegejo.pdfIn PDF document text
    • http://dasuwupozu.22web.org/84993708633.pdfIn PDF document text
    • https://cdn.sqhk.co/nivurerazusa/heihbia/kawupis.pdfIn PDF document text
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/lerinupiliwilafovule.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/2747da14.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/jjhQd8A/nba2k20_locker_codes_ps4.pdfIn PDF document text
    • http://vugijow.iblogger.org/nukinaf.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/aafa525e77cb991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xonelamurojili.rf.gd/60551950364.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/85551934624.pdfIn PDF document text
    • http://zinezalidoratov.rf.gd/73578053558.pdfIn PDF document text
    • http://baromar.epizy.com/94193176916.pdfIn PDF document text
    • http://durunorutap.epizy.com/printable_inference_worksheets_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/sapeme.pdfIn PDF document text
    • http://nopilire.rf.gd/34451607381.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/weather_report_for_angola_new_york_14006.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_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 5708 bytes
SHA-256: f75d4df08ef76b5daaae22d3263ea720b17e3362046de2492c10c8ab7fb17e2b
font_01_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 11148 bytes
SHA-256: fa15c30c42dc0dc13c637b547527f7f1b8cfce2ec2ec7c2d693af95e04566ab4

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