Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6a8e46cd308b1c…

MALICIOUS

PDF

77.1 KB Created: 2021-06-02 02:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5ef512ed96dc961cbcd2ecb64a3c07c5 SHA-1: 7221d557c0bd77acb1cc1f72574644b89aaefc7f SHA-256: 8c6a8e46cd308b1c67131268c8f972d866c2d43f07c59f68919d72f42a0709ff
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=formal+letter+writing+topics+grade+4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371272/normal_6002b0ab909fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5fffc4b8917c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403263/normal_5fcbeb4063874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_6019fdbbaaad4.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/5fd40092-2a4e-48e7-8a1a-479edc6eaaff/vuseja.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/92576223395.pdfIn PDF document text
    • http://pevozowo.pbworks.com/f/nidur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc9cb9a-d839-44a3-8b02-62a7d3463932/hp_4500_ink_cartridge_replacement.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144484821/kiguxozek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48fcb07b-e8ee-4031-80a8-1de5cc745017/google_account_manager_7.0_bypass_apk.pdfIn PDF document text
    • http://pobonagul.pbworks.com/w/file/fetch/144456198/xeragorerakugoxopebutup.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144420024/rerelok.pdfIn PDF document text
    • http://mujusevo.pbworks.com/f/ganong_physiology_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfafb4e3-c907-420e-9abe-cd37bdf80d39/45240020339.pdfIn PDF document text
    • http://tusawijer.pbworks.com/f/how_to_take_child_lock_off_bosch_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2c6820-5ce5-4e38-b1c3-3df8f12cd923/step_granddaughter_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50557026-ee11-400b-ad9f-e8dd4873dc8b/pastorale_americana_libro_trama.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144425226/23324408424.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/24272119358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1dc785-6521-4fdb-84cf-c753144528d4/51527090118.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_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 5528 bytes
SHA-256: 6773ee0eda10ecb82206f8568cdf85ac60c8b3bf21b84f791e1b46608d65f049
font_01_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 10504 bytes
SHA-256: dbcafbf1522b582eaa9506923e0edfb002b4a375e480137a5fdbd5d4eee80014

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