Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdf2b6cc5fbc2dc…

MALICIOUS

PDF

96.0 KB Created: 2021-04-02 00:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e4b850447e07ea94bf125649fdc50c45 SHA-1: bc8a30e65b45b12b5f6aae3a82622959f4a5d902 SHA-256: dbdf2b6cc5fbc2dc14810e6d4d13136bf398b7c4d5b8f082f71f718848c32005
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://jacksth.ru/strik?utm_term=the+portable+nietzsche+walter+kaufmann PDF link annotation
    • http://dajexori.mypressonline.com/ielts_writing_samples_band_8_and_9.pdfIn PDF document text
    • https://giboritozi.weebly.com/uploads/1/3/1/3/131379296/a8d776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370087/normal_6001e2cc19cff.pdfIn PDF document text
    • https://dalagusixofu.weebly.com/uploads/1/3/4/8/134853238/18091330640ea.pdfIn PDF document text
    • http://zebozewazogaso.scienceontheweb.net/isolation_of_antibiotic_producing_bacteria_from_soil.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/99b4b92cea244c.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/65835513449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423430/normal_5fce9104bbab8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454809/normal_5fca5a41e43b0.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/3c60c.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/wamadexupowenes.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/gavuritakukiwimaluxazovu.pdfIn PDF document text
    • http://wabaxifejem.sportsontheweb.net/melosiku.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/cell_biology_quiz_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_60438d0c5d9c5.pdfIn PDF document text
    • http://likefetevu.getenjoyment.net/98233542626.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://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_43fb4033b7a44bb78b30d364e8114c7a.pdf?index=trueIn PDF document text
    • http://kubomefewofumim.atwebpages.com/72220923265.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_c8986e5abd2747ba90be99f75bddd364.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82fa0b99-cf7c-45c9-811d-2643544b12b1/xupebejimezasuwapamese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/189dcb2e-d725-475b-8acf-802e9050c485/23009879724.pdfIn PDF document text
    • https://09af0a6c-c0e6-47ff-90c1-5b173435ccd1.filesusr.com/ugd/b92b66_d01561be479b408587308d90f9fede56.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_ec12ee27866c405eb57c445e492b55ef.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 8072 bytes
SHA-256: 50e11349c98a25c6dd44378057d569b9a76610db7454402321494073c8f96693
font_01_sfnt_off000128aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AA 5432 bytes
SHA-256: 1fb5bb1a01da85ab5bb9c4c0f8ae530c5b065aeab98751599366dbc908249d8c
font_02_sfnt_off00013b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0A 12248 bytes
SHA-256: 81e1f5362964db18451fd84cef086f0f197b9591509943be9b2f95d07f05a2ff
font_03_sfnt_off000163af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361