Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c95f952b1105f4…

MALICIOUS

PDF

77.3 KB Created: 2021-03-17 06:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ea99fbe86ec8420afaa3c8b8742473ff SHA-1: 5afdd50978a1beafeefab684242d735ccd740920 SHA-256: c8c95f952b1105f4ae308171c9afcd9560aaadaba0ffa328236655d66da0aa0e
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://lozipotod.ru/strik?utm_term=resumen+del+libro+el+arte+de+amar+por+capitulos+ovidio PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381098/normal_600065efa2c3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483089/normal_5fcae9f77e68b.pdfIn PDF document text
    • http://fbdirect.site/86647277582dvc46.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/94780909178.pdfIn PDF document text
    • http://apeech.ru/tutorial_imovie_09_italiano8q190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_602da85d7f0bb.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/kfibZv5/nolevokexavititaxifinixi.pdfIn PDF document text
    • http://energytik.net/download_game_playboy_mansion_pc_full_versionpqckj.pdfIn PDF document text
    • https://cdn.sqhk.co/fatobaliv/xFsdZjg/pijiwilu.pdfIn PDF document text
    • http://antonioita.fun/xekotuxazudezzuls6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5fd2546ab943c.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/YheifRY/71121087828.pdfIn PDF document text
    • http://mobile-media.moscow/where_to_buy_metal_detectors_in_australia64jxm.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/37e1ac53-baab-495a-bcd0-7e730fd602f2/mowapalapetiwabinexaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea2cb56-4a8b-44bf-86a3-a52a71c73b97/wowepepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053206cd-862a-4591-94a4-efe81a14782e/american_politics_today_essentials_5th_edition_free.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_3ae25d3d27b6430ea5448781b50fa388.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48256c3a-4c83-4735-9175-d794d048d7ae/can_i_use_a_universal_remote_for_roku_stick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a1301a-307e-46d0-9410-4ccd128dd04b/four_winns_fling_owners_manual.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_71a111ebdb584715aca8a2acb5d34dd6.pdf?index=trueIn PDF document text
    • http://dirazonun.myartsonline.com/aeon_s_end_war_eternal_rules.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_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 5428 bytes
SHA-256: fa07ba8047e2cfec5c0eb41fac3caaeae71125b35bf72e9683012d61c56dd367
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 12420 bytes
SHA-256: 31deae1dba71e3abbd70aef32eb31bee47361f97b4a0c89ce16628de2a314f14

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