Malicious PDF — malware analysis report

Static analysis result for SHA-256 43749bc6d6c608cd…

MALICIOUS

PDF

80.7 KB Created: 2021-04-09 07:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f4892b1235abc6baaef6f5b7c79a8bc2 SHA-1: 16ba829178dcc66f5802006c9ec4e5d797ba5366 SHA-256: 43749bc6d6c608cd6a8f3040e62bec520c8774af950fb8bcecb4a37c5e4b941a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards a phishing or scam campaign designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=how+to+practice+screenwriting PDF link annotation
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/2344382.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/156dc9.pdfIn PDF document text
    • http://itfamily.info/4387580211177dkz.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/7349070.pdfIn PDF document text
    • http://babbieshop.ru/fodmap_grocery_guide_appjmvj6.pdfIn PDF document text
    • http://nudivupekol.22web.org/igcse_biology_notes_0610.pdfIn PDF document text
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/1129926.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/41916910176di32y.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/81125756326.pdfIn PDF document text
    • http://fivadoguna.medianewsonline.com/wekofoduvir.pdfIn PDF document text
    • https://supipujijasof.weebly.com/uploads/1/3/0/7/130739476/turasaw-tivizokezazezen.pdfIn PDF document text
    • https://lulaxakopoto.weebly.com/uploads/1/3/4/3/134331182/ed832a3.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/eb57fc832e83b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_14c70d0be8b84a0aaf3001ab2aab3bb5.pdf?index=trueIn PDF document text
    • http://subogerilazelo.atwebpages.com/unaccompanied_trumpet_solos.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_c1828d3bff144176bdd6353e9e089b54.pdf?index=trueIn PDF document text
    • http://sogisujomixugo.epizy.com/kajumunumuxin.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_f6e8abe45bf34686b8e23de1fa56b0e4.pdf?index=trueIn PDF document text
    • http://lovurezis.rf.gd/15096828984.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/essential_calculus_early_transcendentals_2nd_edition_reddit.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_2855af075e9540f2bee19bbf91a2881d.pdf?index=trueIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_e40f097788974fc9a2793059ff8993f1.pdf?index=trueIn PDF document text
    • http://nijarigu.onlinewebshop.net/woxunowidilosetazotem.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_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 5120 bytes
SHA-256: 56fe72e0a77b40009fe5a7c968d0a0aed30dbb975867c2e5b0f8684af365fb9d
font_01_sfnt_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 10700 bytes
SHA-256: b55a48fc372bc610ae2a660e48718ba98da43ee468219515c3e5220d671f7939