Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c09e11798cc0789…

MALICIOUS

PDF

79.0 KB Created: 2021-05-02 09:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a12ca0f60f03067d446a5e736dbb179a SHA-1: 252debc0a3f208c81a45d79e10a442219249f887 SHA-256: 6c09e11798cc07891dfa1a8fef0e4717327b626642acac1f234188a90925d022
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with one prominent URL pointing to a suspicious domain that includes a 'utm_term' parameter, suggesting a tracking or redirection mechanism. The PDF's structure and embedded links indicate an attempt to direct users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=preposition+activity+for+grade+7 PDF link annotation
    • http://vinograd.io/sekalatobodasamozeduz8sycu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471234/normal_601a2d54570bc.pdfIn PDF document text
    • http://mavpa.fun/2006_isuzu_npr_service_manual3gjya.pdfIn PDF document text
    • http://tibuwajeta.22web.org/libros_apocrifos_catolicos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379035/normal_5fd8e6a5f0c00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_601eeb803ad42.pdfIn PDF document text
    • https://fotewusobowo.weebly.com/uploads/1/3/5/3/135339642/durubekaj.pdfIn PDF document text
    • http://wdd13.ru/tuwubinaseraxakisulebanuw8pfly.pdfIn PDF document text
    • http://barberking.best/8957118130py7ie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_6036ab61be02e.pdfIn PDF document text
    • http://kufolalat.iblogger.org/pawajimorurodaguj.pdfIn PDF document text
    • http://gatorama.fun/washington_state_football_roster_2016p2h8i.pdfIn PDF document text
    • http://formverifiedbadge.com/dumbbell_and_barbell_workoutsfd87.pdfIn PDF document text
    • http://ulekschool.online/jijaxonimasupobuzag6rf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448103/normal_6018c62e21eda.pdfIn PDF document text
    • http://zexawil.22web.org/lokofapuvu.pdfIn PDF document text
    • http://hairhome.moscow/8851929798931yar.pdfIn PDF document text
    • http://opt05.ru/jojulev62962.pdfIn PDF document text
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/af94630.pdfIn PDF document text
    • https://maviwodoke.weebly.com/uploads/1/3/1/6/131606431/kideposutumapo_dadumefi_xitesetixetix_bovewimeteko.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/14bce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://genolesatoj.epizy.com/damien_williams_chiefs_injury_report.pdfIn PDF document text
    • http://robinovedibepo.epizy.com/zivupadusat.pdfIn PDF document text
    • http://toratolobojede.rf.gd/manual_j_residential_load_calculation.pdfIn PDF document text
    • http://zurogizezina.rf.gd/xebemeb.pdfIn PDF document text
    • http://danidarexixuw.epizy.com/53520050784.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/decontamination_and_infection_control_crossword_puzzle_answers.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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 5532 bytes
SHA-256: b3e724cf65797b05b91818ec1e7af0ec0b412ff76430461043c77878c31e99f7
font_01_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 11120 bytes
SHA-256: b7531a1c6f39defd28f079aa59dd0d6ec9d0ad4d9e843cda992b5c876d9915c1

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