Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49f1f0d36cafab7…

MALICIOUS

PDF

71.0 KB Created: 2021-06-02 11:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b55502896f89cc7f3c1e8405152456eb SHA-1: c311c5b9a2df7a0d8b10e3ef48b8b93831eb1076 SHA-256: c49f1f0d36cafab7fc5f13f302c3dc32bde85f936e8df212d742143e82cfd159
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, indicative of a link farm. The primary URL, 'https://cructi.ru/pbw?utm_term=krause+nutrition+care+process+pdf', suggests a potential SEO manipulation or phishing lure. While no scripts were explicitly extracted, the PDF structure and numerous external links are highly suspicious and align with techniques used to distribute malware or engage in phishing campaigns.

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://cructi.ru/pbw?utm_term=krause+nutrition+care+process+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460682/normal_5fe1e9a1a5ae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_60183caf2cb34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_602f4295aa6ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502906/normal_606b86dc43893.pdfIn PDF document text
    • https://dabemevabun.weebly.com/uploads/1/3/4/4/134476179/c82a4e393e.pdfIn PDF document text
    • https://dofetavazazu.weebly.com/uploads/1/3/1/0/131071127/a68a4141b7.pdfIn PDF document text
    • https://sorizovebikup.weebly.com/uploads/1/3/5/3/135386894/4626860.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144446709/zejumodanezoduxakufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e92be0-10a3-46d3-9e65-46b1caef19e5/what_is_technical_drawing_used_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac1081e-999c-48ea-b315-51c4ccbf1cea/how_to_say_no_in_different_languages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17fd1593-e417-493e-a968-c0fb86241a7b/53128888915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381abbb6-43e0-4fb1-8c07-4f52c7181516/ecuaciones_polinomicas_ejercicios_resueltos_1_bachillerato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1df9b6-adc5-4762-810f-912d76fa4270/how_to_setup_brother_wireless_printer_for_airprint.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144424068/super_brawl_universe_apk_obb.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144413187/80448249754.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144499416/how_to_bleach_hair_with_ion_color_brilliance_powder_lightener.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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 5084 bytes
SHA-256: e87e335a185c301ddfab96d3de670d53dd7e7729382802ca1da8d9a3d59354ff
font_01_sfnt_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 10576 bytes
SHA-256: 481488d3a5b9b0f29059cf16b655ddcfc8cb4ae74d07dbf6738fd8e1455664d8

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