Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db99bd7a226463e…

MALICIOUS

PDF

84.0 KB Created: 2021-04-08 04:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c3c4b552f6cce14dcfbe18c989c69ad9 SHA-1: 9859cf1aa7dde223b5b1cb45957c73b57cbb4da3 SHA-256: 8db99bd7a226463e7a29ee182b845e8da1ac23d4daafcc8dd11c046e7632c1d9
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 0.9998

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/strik?utm_term=how+to+archer+push+up PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405950/normal_5fcf4241bb269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_6054e278d37e5.pdfIn PDF document text
    • http://todayshop.website/witulanunoxiwesopalaqzi47.pdfIn PDF document text
    • http://extra-fon.ru/nuzozonajilubiwizujt03xe.pdfIn PDF document text
    • https://lagomumudalo.weebly.com/uploads/1/3/2/6/132681699/9815251.pdfIn PDF document text
    • http://naturalik.fun/metal_radio_online_usazjv3x.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/45549142742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_6048245e43538.pdfIn PDF document text
    • http://copyrighthelpptteam.com/637795561662xaqd.pdfIn PDF document text
    • https://gugebizibepowe.weebly.com/uploads/1/3/4/3/134364706/nagegaxepazefo.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/machiavelli_the_prince_free.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/41401735382.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wobadumiravolu.atwebpages.com/8th_grade_algebra_equations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52cd9a9b-a997-4550-adf5-bb83c33149e6/zerazepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6196c907-f971-463f-9c32-d0423013d0ba/how_to_make_a_motion_activated_light_stay_on.pdfIn PDF document text
    • http://dojorunubi.myartsonline.com/88715146370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8632647-07e1-4215-a5b6-66405df253b8/vanity_fair_outlet_mesa_az.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829a9c04-b56f-4d6e-ad9c-6d294e207625/5th_grade_ela_worksheets_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb47a7b-91a1-493d-9834-6209b1ea65c1/how_to_drive_manual_step_by_step.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 5040 bytes
SHA-256: b851d5bb88423941291f2b36982b08db90cb3560e0f567365abd144583a46452
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 10564 bytes
SHA-256: c63229e800431b8daa27445c1b12dcf47dc09fa90dbf22534dc35030334e146d
font_02_sfnt_off00012b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

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