Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b406811853a826…

MALICIOUS

PDF

84.5 KB Created: 2021-03-11 22:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4da614bb55555336695c20c25e5a4cf1 SHA-1: 15a1ed29291089bcf8c39bd5b0ca6903b9d6998e SHA-256: b7b406811853a826611547103654658030a90eba8e283dd2404b001d2c2306d8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/123?utm_term=canon+eos+m3+manual+settings PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477167/normal_5feedbd7565b8.pdfIn PDF document text
    • http://viwowiziboso.22web.org/fly_fishing_tackle_guide.pdfIn PDF document text
    • http://lady-bug.club/wogerejukirotezaroo8qop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377905/normal_5fcc871eac11f.pdfIn PDF document text
    • http://tuguxanofa.iblogger.org/33010053109.pdfIn PDF document text
    • http://natbeach.space/76170596626k4jc4.pdfIn PDF document text
    • http://regetun.22web.org/make_your_own_home_gym_cheap.pdfIn PDF document text
    • http://lnstagram-helping.live/why_is_kingkiller_chronicle_so_popularotr3x.pdfIn PDF document text
    • http://zarepaputome.iblogger.org/57331158206.pdfIn PDF document text
    • http://metumudape.iblogger.org/subordinated_debt_equity_on_balance_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sulalanetoki.epizy.com/google_sheets_if_then.pdfIn PDF document text
    • http://lexireto.epizy.com/ethiopian_scholastic_aptitude_test_questions_with_answers.pdfIn PDF document text
    • http://fufifaramulemi.rf.gd/taminebibakarupunimulako.pdfIn PDF document text
    • http://nujiwuf.rf.gd/71408635672.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_83334b957b6e4f3aa767e07a853a3f6f.pdf?index=trueIn PDF document text
    • http://wixobemiberug.epizy.com/ishaan_bodmas_song.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_069bd6f78cd34a1db533ace506b76a26.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_41d473c3a2e345d0bcf8d0fcd6de013e.pdf?index=trueIn PDF document text
    • http://dabesajunelazul.rf.gd/why_did_the_puritans_settle_in_new_england.pdfIn PDF document text
    • http://sivuvupaxiju.rf.gd/75088467238.pdfIn PDF document text
    • http://jefebewo.epizy.com/ballad_of_serenity.pdfIn PDF document text
    • http://laxuraxosolun.epizy.com/2681123290.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_15bd63dd411b4efa909fb5470e7fadb9.pdf?index=trueIn PDF document text
    • https://4694dce0-4d1e-4c77-b4da-d1f025f82355.filesusr.com/ugd/fb332b_d24ef817e26d4d3d8c814b4ff31c2f30.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 4976 bytes
SHA-256: 46c44cc55c1fea753decd965891212c1e0730bab5347ce05dfd9d672b75ebe0d
font_01_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 10704 bytes
SHA-256: 2c4bc87beba792abec3fdb3a6005a3ea3288723e14d5aa08dec361126e2ecc82
font_02_sfnt_off0001369f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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