Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9411e71270b5a5…

MALICIOUS

PDF

70.8 KB Created: 2021-02-25 07:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0604d1f34c415bc6161b5b71ed69cec0 SHA-1: 100a7757dc1e2105f10cb4e954fd06ad7f233fc7 SHA-256: 3b9411e71270b5a5b31eb8f678a705981e74783d86586ea009ba4e680f507f1b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be disposable. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. ClamAV detection and ML classification further support its malicious nature, with the links likely serving as the primary vector for user interaction.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=sketchup+free+online+tutorial In PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/4284187.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/eidFggf/3d_chess_game_download_for_laptop.pdfIn PDF document text
    • https://nunokewapi.weebly.com/uploads/1/3/5/9/135961733/ruvez-ralobuvorow.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/9jjiteq/19246709303.pdfIn PDF document text
    • http://lifeshop.pro/zotolijegokatifivuni3abpw.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/ha8ijgg/37537993348.pdfIn PDF document text
    • http://compte-cmbretagne.best/isotopes_ions_and_average_atomic_mass_worksheetjgzkp.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/ifMgihf/nadeguvutifuwetaraxeximuk.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/c9igCb2/bob_the_robber_4_season_2_level_11.pdfIn PDF document text
    • http://megatorg.ru/hypertension_guidelines_2019_algorithme7x08.pdfIn PDF document text
    • http://vermono.site/temple_run_3djwnbp.pdfIn PDF document text
    • http://eliyalte.com/490273633103dju9.pdfIn PDF document text
    • https://mogudigadoto.weebly.com/uploads/1/3/2/6/132695399/vezevixev-limopeza-karasalelo.pdfIn PDF document text
    • https://kapojisu.weebly.com/uploads/1/3/2/6/132696117/kalejupabavijikofobi.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/hhyhdjj/17967909414.pdfIn PDF document text
    • https://gafabudadu.weebly.com/uploads/1/3/1/3/131384489/fusilefunaxa.pdfIn PDF document text
    • https://wakutoji.weebly.com/uploads/1/3/4/3/134314583/tidinuta.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/Y7Ochd4/fogolesupefir.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/leatherworking_classic_guideftjof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 5092 bytes
SHA-256: 50f32c0f9d6760cb061f6439149ebfd91b90fa1c55ec3b4d31b21faf7e280a94
font_01_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 10124 bytes
SHA-256: 4c1e0b8d38efc6643a8c2d2b5e19d9f40ec84b29f3aab91574a6922dbd29a01a

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