Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b654b4c8a4fc97d…

MALICIOUS

PDF

93.2 KB Created: 2021-05-24 17:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b1ed46f400a7be0b03fa199299f3116 SHA-1: c26503b9650d9477fc0bb358f960cf476cb74ed5 SHA-256: 9b654b4c8a4fc97d817a8d8b2d6578bce43c3bce60eb5c151f612f2312389578
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://zajinet.ru/strik?utm_term=gta+4+unlock+code+2020 PDF link annotation
    • https://gimepokik.weebly.com/uploads/1/3/1/6/131636980/6006128.pdfIn PDF document text
    • https://dugorokibo.weebly.com/uploads/1/3/4/6/134651225/reseludobi-ligaluleseme.pdfIn PDF document text
    • https://vokedovewugom.weebly.com/uploads/1/3/5/3/135349322/pomeparisijegunom.pdfIn PDF document text
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/lagek-jesideto-wekepalop.pdfIn PDF document text
    • https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/tazejobafivuxe_nupinegigogun_wubalinisezuru.pdfIn PDF document text
    • https://zejotagidegixop.weebly.com/uploads/1/3/4/5/134522105/8267397.pdfIn PDF document text
    • https://tewagolefavir.weebly.com/uploads/1/3/0/8/130814187/fosifobiruwi_mujetive_fojuzit_xowogirasok.pdfIn PDF document text
    • https://dametubidino.weebly.com/uploads/1/3/1/3/131383661/kimikurofikuwit-kulodotigiju-tavomo.pdfIn PDF document text
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/sovadajogepiz.pdfIn PDF document text
    • https://jajamavufivaz.weebly.com/uploads/1/3/4/2/134235884/8751861.pdfIn PDF document text
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/joruvutijovuj.pdfIn PDF document text
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/546288.pdfIn PDF document text
    • https://nizomepovunamox.weebly.com/uploads/1/3/4/3/134305669/wenozovolewinabu.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/c8fe1d23142d06e.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://s3.amazonaws.com/juvuraguvutoxif/us_army_dress_uniform_measurements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff768f0-edd0-4546-8abc-9e1f0fdbeecd/65933572227.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/manual_radio_vhf_kenwood_tm_261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ca06bf-94c7-4b8a-997a-a9ff1a93beb6/noxir.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_off00011f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 4952 bytes
SHA-256: c41925875081d2851ce7ad8aa8488d735d82d5a868f4ac6277f2baeda8d6ada3
font_01_sfnt_off0001301f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301F 12496 bytes
SHA-256: 2c5e24e2022a6d5011a7dcb0ca137449ce14cccb69a4b0b320c0dcc93af19e30
font_02_sfnt_off00015974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15974 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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