Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4b9d01fca46912…

MALICIOUS

PDF

75.1 KB Created: 2020-12-14 21:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 861dc776d19c110291e4786f801653eb SHA-1: 18395f82f9c4d2a58560a40f53b85d7a569518b9 SHA-256: 0f4b9d01fca469123f5e3b753a1a18a6bd6634ca26a53e61db091c7e64482ed9
244 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The embedded URLs, such as 'traffine.ru', are flagged as potentially malicious. The ML classifier and ClamAV detection further support the malicious nature of this document, likely serving as a lure for phishing or malware delivery.

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
  • 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 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.
  • 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://traffine.ru/123?utm_term=2014+ap+chemistry+exam+multiple+choice+answers In PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/suvin-nibaj.pdfIn PDF document text
    • https://jepirozo.weebly.com/uploads/1/3/4/4/134474462/tufevodumikotu-fazizetafanuxo-rasovorufub.pdfIn PDF document text
    • https://moxoviwepikiwu.weebly.com/uploads/1/3/2/8/132814726/rusitalubof_gudeganif.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/b468a014b90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f9b1bfc7aaac.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/2304345.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366042/normal_5fc4ea3fc48be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc53aa03398ff75154a37f3/t/5fd6105e9264095525ca32a0/1607864415049/banner_making_guide_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2c477c-3b5c-4ec7-b48c-b236df580738/56460668193.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7963a161f8068becf528c/t/5fcae20121c0486e918992d9/1607131649799/82156729118.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/borders_to_contain_river_sources.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae579d8-3126-4852-9377-b85a47038e17/thousand_cranes.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/74920586722.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_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 5756 bytes
SHA-256: 13d1d6d5bc7c172fbfaa8b2b526b16e4cc227ce538ed68318d0b6216ef52950b
font_01_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 11224 bytes
SHA-256: 08921ebc92ad2b6af711990624b381e313cb64426cd906e32ee0d4e097e96fb3

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