Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2d9a02e2d04a12…

MALICIOUS

PDF

83.7 KB Created: 2021-03-20 18:38:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7f0888238b93591842acbbfa1cf68b58 SHA-1: b6f840ad594b7a807aee4406761fc838f5888724 SHA-256: 8b2d9a02e2d04a1220cce0e2bd94e2486d0d92c5b6a431a5fbc0e6b0f5a38094
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to direct users to potentially harmful websites.

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://nipisod.ru/aws?utm_term=can+you+hold+me+can+you+feel+me PDF link annotation
    • http://zememor.sportsontheweb.net/94344822652.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/ibps_result_2020.pdfIn PDF document text
    • http://vofufime.mypressonline.com/bach_minuet_in_g_minor.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/loladibaneref.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/rimewimexetidewumodaz.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/5fdc3017a6.pdfIn PDF document text
    • http://kevarusakoko.mypressonline.com/25522652737.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/cat_428_backhoe_manual.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/natasunamaromimobes.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
    • https://s3.amazonaws.com/kufazete/foolish_heart_steve_perry.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_9bfcb6dabbf649f9a53c6170edb622bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/natewared/wabofisenevavosizatepu.pdfIn PDF document text
    • http://gagavig.rf.gd/curso_de_ingles_basico_descargar.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_6bd1083fe77a46709ace03026df63ade.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefovu/aku_milikmu_malam_ini_cover_felix.pdfIn PDF document text
    • http://ditufadupogeju.epizy.com/11637156573.pdfIn PDF document text
    • http://gafibis.epizy.com/xenororomep.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/diccionario_strong_espanol_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 4864 bytes
SHA-256: 90ebb353af485069d6d4ff8f2d03d1262e9b030a0771fbb1b9d284601be3476e
font_01_sfnt_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 10972 bytes
SHA-256: 4c9b5bdd480fb416c0ec1c4828982a69da1700433548a9f46394b4b5ee80bf6b
font_02_sfnt_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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