Malicious PDF — malware analysis report

Static analysis result for SHA-256 3732793cb40dc10b…

MALICIOUS

PDF

83.7 KB Created: 2021-03-31 23:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e4601f741e0f1a64ce06b0018316b2d1 SHA-1: 1f8c6b40adc791eb0047c7008978071350d0efc0 SHA-256: 3732793cb40dc10bab6fe164043c20072ddbe5a78d6e280c2ff42c51ea8ea2d2
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://crophysi.ru/123?utm_term=avg+free++2017+windows+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403672/normal_5ffc84404718c.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/hdjdRjV/lusixesime.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/mjghgbL/45049986518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_60203a1dea0f2.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/1hcjhFY/91591825989.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/Qggji6V/diy_popsockets_from_scratch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5ff5e006db255.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/ddjhjeU/durabuboxexulozivuwufi.pdfIn PDF document text
    • https://nakowubolitek.weebly.com/uploads/1/3/5/3/135349387/jojevagezumam_levenuboler_vasogumejatijir.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/jfiavgi/65446904701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_603f545584440.pdfIn PDF document text
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/tewesub-dumupiwetuvifok-fusuduxukabum-wigupa.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/fNicjb1/leap_day_birthday_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/wufaluvete/Ahagjgc/gipetivibugobo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379718/normal_5fc61bb28d813.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5ff486b187e96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_6014f426debc1.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/fVJ4Chb/68581444215.pdfIn PDF document text
    • http://rorureferujuraf.22web.org/safagokalizi.pdfIn PDF document text
    • https://cdn.sqhk.co/maduzonuxoke/KUTrojb/100_cool_games_unblocked_fireboy_and_watergirl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipiroto.rf.gd/wujowamaferef.pdfIn PDF document text
    • http://volemefejosi.rf.gd/principles_of_heat_and_mass_transfer_8th_edition_solution.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_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 5380 bytes
SHA-256: b97b3d3be8104ee16f980d54caf3ea21ba39789f7fccb18816458f3faaaac193
font_01_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 23228 bytes
SHA-256: 1d0e3f270e6a74300a61315f1a1a7cad5e8614f9ca1787dece2f6dce093860e9

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