Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c4f0aca484a34f…

MALICIOUS

PDF

74.1 KB Created: 2021-03-27 11:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7d6e962a450a599f1d390ad99be5ddfb SHA-1: 6c0fb0729c40fd1093cd380d914d399deb2a47fa SHA-256: b1c4f0aca484a34f688ac89e8954c3ed0fb9df031673bf0eaf7e5cbc93abeb82
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the document body's deceptive content support the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/123?utm_term=create+data+entry+sheet+in+excel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454277/normal_604fc7f510231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_6058e121ed84e.pdfIn PDF document text
    • https://jasefeneg.weebly.com/uploads/1/3/4/4/134489721/gufisonivodonuxaboz.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/nawusumowiduk.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/8jhhfie/tatojogavad.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/ehjdjcd/wakakuleminezeduloluleg.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/tennis_elbow_physiotherapy_exercises.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/air_waybill_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424696/normal_5fdbe1a4b0add.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/kicXhhu/418206125.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/sunija.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/berserk_art_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_604ad81d31e13.pdfIn PDF document text
    • http://suraneb.scienceontheweb.net/kseb_assistant_engineer_exam_syllabus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_f60f7909bc4c4d76aa5cd1dfaeb10ebe.pdf?index=trueIn PDF document text
    • https://db6d3479-2aeb-4a59-914c-1f55c48648c8.filesusr.com/ugd/9f5433_04a0a85b213840f7b5e0dc4da417509a.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_3672233cb27747aca807bd44d47ef6a5.pdf?index=trueIn PDF document text
    • http://sanojepenot.onlinewebshop.net/excel_vba_function_return_value_example.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_f966c51edf1a4208a3508b8af13096ad.pdf?index=trueIn 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_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 5104 bytes
SHA-256: 44547141e598abe3ac04ca816e63e1c6076d565c65d489599df84f3c4298f1ec
font_01_sfnt_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 10908 bytes
SHA-256: c4b5b935328f1e1049e2d52888e95acfee867875bf6cb0f15cba36b2a972084b

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