Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c242b3683a8cfe4…

MALICIOUS

PDF

71.3 KB Created: 2021-06-02 05:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fcd16efd8027ddaf8f69a4c63e17d999 SHA-1: 75d9e93f75583d78f7b2330f8b7d546e3d2e8ec8 SHA-256: 5c242b3683a8cfe42956092856a7eaab6406cca47972d4be5391a3f824908464
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=konica+bizhub+c458+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493579/normal_606b5068ba3e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5fce48001fc2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_606a95d721f66.pdfIn PDF document text
    • https://puponefunojubuf.weebly.com/uploads/1/3/4/6/134670615/dojazefirepinotabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_5fd79a8bd0f42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425224/normal_602c01ca11514.pdfIn PDF document text
    • https://wudopivuvev.weebly.com/uploads/1/3/4/7/134752163/fopudod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373757/normal_60039bcbbf205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_604cb49011522.pdfIn PDF document text
    • https://xugowumilivave.weebly.com/uploads/1/3/4/8/134846580/41ec635b349169e.pdfIn PDF document text
    • https://vesedosaripiwuj.weebly.com/uploads/1/3/1/6/131636692/sowixerilofokekinel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418747/normal_5fcf83415b436.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391898/normal_5ffacb8d213ad.pdfIn PDF document text
    • https://puzapageduz.weebly.com/uploads/1/3/1/4/131453954/zotufagobatinagivodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_606437704ad87.pdfIn PDF document text
    • https://baboromet.weebly.com/uploads/1/3/1/6/131606353/7ef210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_602e0c05e667f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_6013c169b219f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144448233/que_significa_no_tener_sentido_comun.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/f/50423564297.pdfIn PDF document text
    • http://pafunanukexe.pbworks.com/f/6814490063.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 5332 bytes
SHA-256: 0627bd72f23b4c425df2331d3fa2a42a33c7561c44d83cb468ebd978b67400e0
font_01_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 10352 bytes
SHA-256: e51f6e3d56e3de48b17b7e2f81b71c75fdd6be7a1a823ad7eff9f89ac470f17b

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