Malicious PDF — malware analysis report

Static analysis result for SHA-256 f463b29003e23dda…

MALICIOUS

PDF

72.7 KB Created: 2021-03-09 10:23:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: abd6c3a25ad3a5e061e89b0d4df4f272 SHA-1: 564a247aac41c9fd6642d89b950ff557dfa114c7 SHA-256: f463b29003e23dda213f518e8acfd25ba1a18dc8f7dbf077ec047764eb4a4e91
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://seumenha.ru/award?keyword=academy+stars+1+pdf PDF link annotation
    • http://bidetoluji.getenjoyment.net/pitamifixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_604166d128450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424341/normal_6039bbba2756e.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/filitixibaruduxiwirid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_5ff97f49268f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491451/normal_60401a3d26f01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_719bba50c72143e691dd99e6047e31bc.pdf?index=trueIn PDF document text
    • http://jizuperuxe.epizy.com/adjectival_phrase_examples.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/lobupuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10bf471e-70ad-4e7c-b51b-df7337b68ee0/kuxozanigize.pdfIn PDF document text
    • http://zijemuviwovo.rf.gd/alexandria_city_police_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c221c67b-2168-44f2-aef3-cb1a11c3d406/tited.pdfIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_09c1c372f5524f7b96e9659a70a42dda.pdf?index=trueIn PDF document text
    • http://pudolajuji.atwebpages.com/basic_spoken_english_course.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_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 5412 bytes
SHA-256: 8f467baf946907564fc6ec2c97176ef20a1007297841f45c6a880a46d44b99ab
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 10552 bytes
SHA-256: 58fb23d4e31b09134b1b1a1e2b70f467344f1c426791940840df01adf13c81d4

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