Malicious PDF — malware analysis report

Static analysis result for SHA-256 f308f5c54a21ce19…

MALICIOUS

PDF

73.8 KB Created: 2021-06-14 13:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 879705d6f9892dfce1428230938c653b SHA-1: cad3e0dde940505aaa2a76943784b483ac0b7bdf SHA-256: f308f5c54a21ce19876e8eaa182f048b74dd2588c0422e4ce03710cb1a25e24d
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/pbw?utm_term=performance+appraisal+sample+for+nurses PDF link annotation
    • https://kesozawowoguza.weebly.com/uploads/1/3/5/3/135310598/9654934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_6050d6c570c46.pdfIn PDF document text
    • https://siwevobone.weebly.com/uploads/1/3/5/3/135317475/pitujujov.pdfIn PDF document text
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/8802554.pdfIn PDF document text
    • https://nekazadezi.weebly.com/uploads/1/3/4/6/134662300/23131da.pdfIn PDF document text
    • https://taxepenobeg.weebly.com/uploads/1/3/4/3/134355702/naketavilokixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421970/normal_5ff2f43198430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tulezibat.pbworks.com/f/jexanudaxixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99363867-1727-430b-b4a8-03da1b109d72/48284425467.pdfIn PDF document text
    • http://nusometa.pbworks.com/f/gunojijezom.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/f/free_robux_hack_cheat_engine.pdfIn PDF document text
    • http://pusavivo.pbworks.com/w/file/fetch/144461616/engineering_mechanics_dynamics_7th_edition_j.l_meriam_l.g._kraige.pdfIn PDF document text
    • http://xudusuvo.pbworks.com/f/56898797889.pdfIn PDF document text
    • http://fawitugeva.pbworks.com/w/file/fetch/144801903/wibojipogunagabikexe.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/wings_of_fire_starflight_x_fatespeaker_lemon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00672ca-12ab-4409-a050-a40f80d47830/kazadozazezugogizu.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144981606/87963899319.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418446/voxukufosegalaluzogitowet.pdfIn PDF document text
    • http://lezakoliz.pbworks.com/f/texas_jurisprudence_exam_study_guide_psychology.pdfIn PDF document text
    • http://kemususi.pbworks.com/w/file/fetch/144756129/disapajife.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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 5164 bytes
SHA-256: 78d970fdaed366d3edff17643a53ef6baa7c1d17bee6e22aecfd7aef13b40470
font_01_sfnt_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 10684 bytes
SHA-256: 8499e2abc3f016131031565bf37c965c5eedc8f59b6023201acea0cf469da6a1

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