Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eff5b3b5c672230…

MALICIOUS

PDF

75.9 KB Created: 2021-03-05 11:16:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 95519aec1fb1cba337d36e6a12af2e00 SHA-1: b2dbce9ec16a8a2cbdd72ae8cb87505e264930d9 SHA-256: 6eff5b3b5c672230961797e7602df5ea94d9032be21188442f984f6c50632da6
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 exhibiting link farm characteristics, strongly suggesting a phishing or scam attempt. The ML classifier and ClamAV detection confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/123?utm_term=definicion+de+derecho+procesal+civil+y+mercantil PDF link annotation
    • https://tasimaxexakopox.weebly.com/uploads/1/3/2/6/132681882/4756528.pdfIn PDF document text
    • http://yoga-italy.space/participles_as_adjectives_list37evj.pdfIn PDF document text
    • http://pornbustyvids.com/html_form_enctype_text_plainuup1c.pdfIn PDF document text
    • https://fasanubuxa.weebly.com/uploads/1/3/4/7/134733786/7ce3623b8721.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/why_does_my_big_buddy_heater_keep_shutting_off.pdfIn PDF document text
    • http://bebinovixox.iblogger.org/giwonoza.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/72537842985.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/what_happens_when_you_bleed_to_death.pdfIn PDF document text
    • http://liketsven.xyz/30562059767vq1io.pdfIn PDF document text
    • http://paxibokojusaduw.22web.org/lubamusigov.pdfIn PDF document text
    • https://nixixope.weebly.com/uploads/1/3/0/8/130874324/fbe7a2a.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/SMghChd/dead_paradise_3_y8.pdfIn PDF document text
    • http://feedbacrnz.space/63359414386stpu3.pdfIn PDF document text
    • http://hq-cleartv.info/city_of_stars_instrumental_sheet_musicpw1q1.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesiwafo/9IhjGjj/vinujijaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59aa2058-d239-4add-9451-cc83983ce3c8/tablet_weaving_patterns_10_cards.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/bejogit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6200bb07-23c6-4554-b1de-c06ed948311f/foripolotuxuvepexikigoja.pdfIn PDF document text
    • http://bisubop.epizy.com/physics_formulas_list_for_jee_mains.pdfIn PDF document text
    • http://magivaxinel.rf.gd/vipigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f860315a-3573-4eed-ac57-4f4f1ea189b0/53385717694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9540b037-9300-4f0b-9fe7-7f02dbf9a21b/applied_calculus_by_hughes-hallett_et_al._wiley_6th_edition_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59427ae6-5464-4c02-af86-8d16367569b9/what_does_c_reactive_protein_test_show.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_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 5556 bytes
SHA-256: eb6cc913be25fd80739e82716860b79f3f247e60420fc25ccdce9673c52e92e4
font_01_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 10592 bytes
SHA-256: ed0f501cc9da8e9ad5cb1ad5b34344d28372c8a3129604af1fd3b106c15515b9