Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b593e35daeac0c…

MALICIOUS

PDF

70.7 KB Created: 2021-04-05 13:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b9d717237494d87f7bf4eb196d5b9a14 SHA-1: 9a4bc474bdda52fdb46478129ce7e00e8504fb98 SHA-256: f4b593e35daeac0cb104bff5322271c70b178b077386ce423e4b9bc305aec46c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though partially corrupted, appears to be a lure related to product pricing, likely intended to trick users into clicking malicious links.

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://xajibur.ru/strik?utm_term=wd+my+passport+ultra+2tb+price+philippines PDF link annotation
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/busenetekawawot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_6055b4f2cd601.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/are_apple_books_free_to_download.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/getting_ready_for_marriage_workbook.pdfIn PDF document text
    • https://ragixadimeruwu.weebly.com/uploads/1/3/4/8/134897014/xaluxo-wuwivule.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/posikexak.pdfIn PDF document text
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/84a4eec0.pdfIn PDF document text
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/0adb9f621231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_602ac1f2570db.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/how_much_does_it_cost_to_fix_a_refrigerator_compressor.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/los_adjetivos_en_espaol_ejercicios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foxivowopejo.rf.gd/puzalonuxajukenerov.pdfIn PDF document text
    • http://turijebudeta.rf.gd/effect_water_pollution.pdfIn PDF document text
    • http://dimakadube.epizy.com/lovasid.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_4d45d0c1dc8742c9a7561be27dfdfd6d.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_26a42b9dfdf64507b2ab7dbab8a6abf7.pdf?index=trueIn PDF document text
    • http://reratosagozi.rf.gd/rental_lease_agreement_forms_free.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_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 5700 bytes
SHA-256: 8e3dfc21c7592900e6ea5c1229559f40259d931fe7cd01ef672ca431e67d2e1c
font_01_sfnt_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 10916 bytes
SHA-256: 1faf157fd72df502a6a075835fe310938d9b9cb03f6983fe1bc03146696c0664

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