Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcb0d8a3147573e…

MALICIOUS

PDF

79.0 KB Created: 2021-02-20 20:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ee6e670c45a96eb4902d2f2c620388b4 SHA-1: fff69daf822c9f3345a19cb1185a41fb437f01be SHA-256: 7dcb0d8a3147573e3b7ab1a0ed7546bae86a5d7f8157453b8c40beeac66bdeb4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to harmful content.

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
  • 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/123?utm_term=what+are+the+challenges+of+being+a+student PDF link annotation
    • https://cdn.sqhk.co/rajunakeb/F1TjcTb/mizazasesovenuniti.pdfIn PDF document text
    • http://mosquito.codes/libro_de_kamasutracbb6b.pdfIn PDF document text
    • http://rubeatyshop.xyz/commonly_asked_interview_questions_and_answers6fzif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421782/normal_5fc79e3188123.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/cargill_inc_annual_report_20193mhju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444096/normal_5fd3181d4263b.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/yPiiGhe/penguin_running_speed.pdfIn PDF document text
    • http://pitukegurajokup.22web.org/the_mis-education_of_the_negro.pdfIn PDF document text
    • http://japancar-sib.ru/birthday_card_for_best_friend9wo14.pdfIn PDF document text
    • http://kismykeitio.best/requirements_for_church_wedding_in_the_philippines_2018ak0pj.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/jeifnSB/vazepak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_60177fc1a6ece.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/pusixa/47333312440.pdfIn PDF document text
    • http://zewedazogiwake.rf.gd/dragon_s_lair_summoners_war_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/74634224910.pdfIn PDF document text
    • http://madujenorenugax.epizy.com/lich_king_hearthstone_guide_2018.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_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 5436 bytes
SHA-256: a20150ce7e9978ea6e9b9d9f4326f932e23878825a3adc6e47bf374d59974eca
font_01_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 11692 bytes
SHA-256: 04d9d75366d9debc347121a2377d1568c41a46a6a83f9eec520f7b7952a179c9

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