Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7ce4a95853b1d1…

MALICIOUS

PDF

63.3 KB Created: 2021-02-21 23:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d6859e0e8be8de83aba8816bf63b5c52 SHA-1: 2d3c4009bfd272b5d2903318a019d33aab2057dc SHA-256: af7ce4a95853b1d1d951b6220b8d29cd8a83d72b1c0dc7ff091dab7e69d7e753
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 0.9998

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://leonvi.ru/123?utm_term=kanawha+county+school+schedule PDF link annotation
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/4598248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501214/normal_5fd049d62bc66.pdfIn PDF document text
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/7b386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_6011ea64a19e3.pdfIn PDF document text
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/gamuvefuxagoxujuniz.pdfIn PDF document text
    • https://bitusuverutito.weebly.com/uploads/1/3/1/8/131871453/zenafewesa.pdfIn PDF document text
    • http://ubsvp.com/raizes_brasileiras_sergio_buarque_de_holandapsdqe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5ff032e61966d.pdfIn PDF document text
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/busikevidolofix-mufam-mejewudob-nelokolov.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/nizabuzeno-wuzutulelosib-tuturovojupa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_5ff41807121fb.pdfIn PDF document text
    • http://vizit.store/whirlpool_cabrio_dryer_f1_fault_code5omir.pdfIn PDF document text
    • https://kigolakelo.weebly.com/uploads/1/3/1/3/131380934/5583f058.pdfIn PDF document text
    • http://ru-dev.xyz/9_snf_fizik_konu_anlatm_indirlacxr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_5fd671388f426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fcb7039a881b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492588/normal_602d057848a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_60175208c9aae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/amnesty_scheme_2019_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/nationalist_school_of_historiography.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_off0000bd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4B 5096 bytes
SHA-256: 5937b63f1d39e38b332491e54c8a26bb5d51ed3ed4aaa71729aa1ed54c213b79
font_01_sfnt_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 9864 bytes
SHA-256: 144b1f8fef97c525ba684c13945f0bccb412a56660fef72b70afb05519cd3b32

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