Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eeef4a2812fd59b…

MALICIOUS

PDF

97.0 KB Created: 2021-03-10 05:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 36b0d2fb4edb9372c1ca6316bde71258 SHA-1: 170667550f945809c217aa2a2cf20e6855379646 SHA-256: 5eeef4a2812fd59be68751fb1b64d4c3ebea1b210af833d0f380e394c5eb0a0c
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-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://xezojetit.ru/123?utm_term=bitdefender+antivirus+plus+2019+software PDF link annotation
    • https://cdn.sqhk.co/goberirud/hjbghgd/restaurants_near_cross_roads_tx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416500/normal_5ff1da1635172.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/hcZ97je/88089348732.pdfIn PDF document text
    • https://cdn.sqhk.co/bipujawojeli/igjexZw/rigotutilegidodixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415756/normal_600a06537ec77.pdfIn PDF document text
    • https://cdn.sqhk.co/jawezumate/Qgh67jf/tank_stars_best_tank_to_use.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_602d64e0a9d25.pdfIn PDF document text
    • https://cdn.sqhk.co/milagaleja/lSgeH6L/happy_merge_family_farm_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_602eb782109d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462352/normal_5fc813c12347a.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/hmaKw83/29414061806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_602e4d419c783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476768/normal_5fe3abf35a429.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/fvuhjNv/tik_funny_short_funny_videos_clips_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_ab67ec4c06b047aabb4671824ae103f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mipeboro/application_for_bridging_visa_b_form_1006.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/24169345841.pdfIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_5b56878aac79430ca5f5672761f439f2.pdf?index=trueIn PDF document text
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_7dca4dd23f3443fb96730bddd746d745.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_183f7a8dd92c4cfab51558800f3c1ea7.pdf?index=trueIn 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_off00013d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D84 5716 bytes
SHA-256: eb60489ea8f561ee0cab4c9180f1a6b3f7940d3c18392f39ede92f2559b636f1
font_01_sfnt_off00015124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15124 11124 bytes
SHA-256: 1035224d97045a6e511ce7b0069d949746d0fd4bc832383922e9ae5a429d1b86

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