Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd62c734d62c440…

MALICIOUS

PDF

87.2 KB Created: 2021-03-16 08:24:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 82f89eb9df0df38f39801b2d9e274138 SHA-1: c945ddc1009846cd50c3c0fcd1359f4c53ca073f SHA-256: 4cd62c734d62c440fcbd3f0fd706bb44e75893d3af6f47d38fce7b5bb8901116
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the presence of multiple suspicious URLs points to a social engineering attack, possibly related to spearphishing.

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://baarspo.ru/123?utm_term=impartial+reporter+enniskillen+contact PDF link annotation
    • http://helpcopyright-service.com/21418744754qts1z.pdfIn PDF document text
    • http://crispyset.online/ravuluvudorogowegis282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401971/normal_600de1d821482.pdfIn PDF document text
    • http://itfamily.info/30590995721205op.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/trigonometry_angle_formula_table.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/pirawavarikajokepev.pdfIn PDF document text
    • http://popularchoice.space/plane_simulator_2017_mod_apkqvv4x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_60163770d9004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiluxusimutine.atwebpages.com/96115089877.pdfIn PDF document text
    • https://f48d4657-0741-4d03-86fb-270e41f4932c.filesusr.com/ugd/6166c9_19928ef180a447ada39b4a9f0e476209.pdf?index=trueIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_9ff29648627d464eb9523c6f80d7a39f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagubip/call_not_answered_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/vampire_diaries_season_8_episode_1_full_episode_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/gateway_b2_workbook_answers_revision.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/sotixilakeruv.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/how_many_calories_should_i_burn_a_day_for_my_age.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_a617f7d99e7045539866e5bcc7446af4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/educational_technology_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/gmat_official_guide_2020_difficulty_level.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_off000114b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 5080 bytes
SHA-256: 9578402ac9baaa4023baadaeefd648a3a69c735550332fb29a29f3734542ee71
font_01_sfnt_off000125e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 12304 bytes
SHA-256: 942795eade81d866bf7b04f2c352f938a90f4147cdaa8c8c39ded1aef3ed4d0c

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