Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43fd8b38d2632d8…

MALICIOUS

PDF

85.9 KB Created: 2021-03-28 12:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0a18d1ad79b68d6c1947e216db064457 SHA-1: f1d392a7ddd73a5b9d984cb1e313d3a1755f8175 SHA-256: d43fd8b38d2632d8a6daf5feb87852d84553ffe2b09dd364d33feff20698d3b3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/award?keyword=30+day+ketogenic+vegetarian+meal+plan+pdf PDF link annotation
    • https://butilitari.weebly.com/uploads/1/3/3/9/133997497/5d84cdfab0.pdfIn PDF document text
    • https://sixofufi.weebly.com/uploads/1/3/4/3/134375841/a19e8e6fcc91ff1.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/ghdggy1/polimusegolewusegujobo.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/nujajafijalag-manaxaxenu-zaxezer-butanomami.pdfIn PDF document text
    • https://sobidoduwipiver.weebly.com/uploads/1/3/1/4/131406433/kewujufobewevilex.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/widupo.pdfIn PDF document text
    • https://tejikapor.weebly.com/uploads/1/3/1/3/131382395/9e39e89.pdfIn PDF document text
    • https://cdn.sqhk.co/bepigulusibe/5kHVKgc/sound_effects_buttons.pdfIn PDF document text
    • https://lolimoxozidexus.weebly.com/uploads/1/3/2/6/132682882/91465cf9f5a7.pdfIn PDF document text
    • http://zabopibisoxe.22web.org/zekawotufifibijibizux.pdfIn PDF document text
    • http://nebolizixake.iblogger.org/55277848866.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/darotuzo.pdfIn PDF document text
    • https://digavonuvuveg.weebly.com/uploads/1/3/4/8/134851043/jinutukokon-xevedudasoborib-lolazezuloju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/940e952c-3555-440e-9e7d-f5c1fee727f9/53298625987.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/asmedia_asm1083_datasheet.pdfIn PDF document text
    • http://kevixavi.rf.gd/82786001892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3240cfed-7670-4dd0-a73a-5e77633dc3c7/zmodo_system_password_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f298b578-933a-46f9-a824-ef4a195c61c6/is_book_of_sith_canon.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/hiit_bodyweight_workout_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5b7178-feb9-4ef2-ad71-9a8c4da3a792/48536014379.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/83951833057.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/huffy_beach_cruiser_comfort_bikes_20_24_26_inch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c96887-f30d-4092-b500-bc68dab5249b/is_there_a_2nd_eragon_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 5520 bytes
SHA-256: 8f7d95bfd69880c0527aa311e3268d739d7f37a3d15a20e6c48ab0a4c9566543
font_01_sfnt_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 11920 bytes
SHA-256: 92398ca7acacf5662e9c329f8d6159a205e4036655fd2c452383dae47b5dbde7
font_02_sfnt_off00013bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3