Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4ae3c0d4b3d486…

MALICIOUS

PDF

73.1 KB Created: 2021-06-05 08:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dab5af9c0d1915fb1d9f7c6e17cf1c44 SHA-1: 660fadf9e2cf895224f384e5e07140fff07487a3 SHA-256: 4f4ae3c0d4b3d4860f88c482906e680d460167999cde10cf4afbfc3c6c2d1802
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a primary suspicious URL being https://smidgel.ru/pbw?utm_term=escape+prison+game+codes. The document's structure and embedded links suggest an attempt to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/pbw?utm_term=escape+prison+game+codes PDF link annotation
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/36e19cea8bf15f4.pdfIn PDF document text
    • https://fedibikora.weebly.com/uploads/1/3/4/5/134508081/5737675.pdfIn PDF document text
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/5225398f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458417/normal_5fcaf6b2e06ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408172/normal_5fce188f0c98c.pdfIn PDF document text
    • https://zakutawevuvukug.weebly.com/uploads/1/3/5/9/135970657/97f6785fbf479e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6bfb9f-a233-4e48-8f3a-a391ce4afd1e/89640036109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bcf8253-3685-49c0-b072-dafe723c727f/buying_a_used_car_victoria_covid.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/58491259631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db2cc249-cde2-4809-8e7f-9c9801a9a1d1/watch_dogs_2_download_for_android_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863595a0-ce27-4919-886b-7f01837e042d/what_are_dead_stars_made_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735b5cf2-4d82-45ec-ad56-af5fb942ceea/what_is_a_voidable_contract_give_example.pdfIn PDF document text
    • http://felefejimax.pbworks.com/w/file/fetch/144524007/35317141383.pdfIn PDF document text
    • http://beratirupo.pbworks.com/f/6601128058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40415098-d2bf-4bd5-a530-992a2a3279d6/kivan.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/f/como_se_reza_un_rosario_para_los_difuntos.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/damifiregafumotajogona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ed2b9c-f554-48fa-955c-bdfbb23d10c0/mizaruwarononaxabofakulod.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/f/xufopu.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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 5320 bytes
SHA-256: 0bec3e85a8ee7a78079ac26cd90b4dbbe28382c98713950f5057dc2c9882fbe0
font_01_sfnt_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 11388 bytes
SHA-256: d720fd2da4d9319527d91e3f095de39e260e97f3c19996167b09a5600cc61f1d

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