Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e144a170ebd7d1…

MALICIOUS

PDF

73.9 KB Created: 2021-04-18 11:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b7f693d9a833a4f124ece665322466a1 SHA-1: 429f87beb6cd9e7ba411ffadedd0147f8ecfe49a SHA-256: f3e144a170ebd7d12e9ad516f0778a129a3ce37f6aa2eb5e19012356e5553c36
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL suggesting a lure related to a 'digital marketing course london'. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=digital+marketing+course+london PDF link annotation
    • http://tuderoba.getenjoyment.net/fluke_1507_manual.pdfIn PDF document text
    • http://zovitidagawas.sportsontheweb.net/nuzerotuselataxixomi.pdfIn PDF document text
    • https://zovuwiveja.weebly.com/uploads/1/3/4/8/134880504/zokulevapixopeb.pdfIn PDF document text
    • http://vufajed.getenjoyment.net/personality_quizzes.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/88556142617.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/75039736002.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/carding_amazon_2020.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/parasitic_capacitance_in_mosfet.pdfIn PDF document text
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/b6c0d9.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/12655824296.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/5f637ea3.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/ladojenefe/odynophagia_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/10788530841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf46cfb-46b2-4fc2-bb0e-7e19067c2033/how_to_negotiate_a_lease_buyout.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/baserimizulapaxituga.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/uc_browser_ad_free_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/walmart_black_friday_cyber_monday_deals_ad.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_f6ec5fb3f1b449b0bfd56ca80d11806b.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_042bd615643940e18f15d06d8f75a170.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0e1123-c64d-473e-a071-50fefe1e321e/free_printable_2nd_grade_math_word_problems_worksheets.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_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 5320 bytes
SHA-256: 89fbc4e4f4a94e8387a4d840d59c2ec42a0028ae3c2bca4414d8225747487797
font_01_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 10204 bytes
SHA-256: cbe389cdc1c238ced5a9fadcd093f7a27c4e464863628b7cc07054b8f13ef876

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