Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96cd907b7e44af6…

MALICIOUS

PDF

82.0 KB Created: 2021-03-23 18:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cf65e3b57bc3493d081c5049845c16f2 SHA-1: eb2a61167b75b6db76fd44c124b450d742199a0b SHA-256: b96cd907b7e44af6cd8424cafd426cacebcf5680534304d4f95e3b54f8c274f3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://yafferge.ru/strik'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to team dynamics, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=what+are+the+five+dysfunctions+of+a+team In PDF document text
    • http://bapatavusirave.mygamesonline.org/25463896143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459794/normal_5fc9fa699813d.pdfIn PDF document text
    • http://domavera.ru/nakibewidexasobiwulidhfzn1.pdfIn PDF document text
    • http://superheatbelt.xyz/best_friedrich_nietzsche_quotesao5zt.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/18649443316.pdfIn PDF document text
    • http://djami.ru/hp_7520_printer_priceqg607.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/11092793683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467915/normal_60580faa96d2e.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
    • http://lopafulobitap.atwebpages.com/nutrition_education_definition.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_679c8b686de04379aa7365683ba40c8f.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_f7b4bdf4aad9421ab83ce0f32f580ba4.pdf?index=trueIn PDF document text
    • http://nejarisiwudu.atwebpages.com/19503369021.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/71658754561.pdfIn PDF document text
    • https://dd3a609d-fcd9-461e-ae06-f7e9ec6f332d.filesusr.com/ugd/811c3f_3fe3ad70be514f018f51bbfc9cd731c8.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_186c5ccba6574fe291749cd5acc451a0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 5284 bytes
SHA-256: bc5237cf8f9179e0854e515bdd2fea777b0b8c469a7f4ccc2601d041ef15290e
font_01_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 10712 bytes
SHA-256: 074017af271c2b0f6dbb5f38ab3b75f96714df7e1782a84a657377a6238f31a7
font_02_sfnt_off00012cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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