Malicious PDF — malware analysis report

Static analysis result for SHA-256 b209e4e9cd13eab8…

MALICIOUS

PDF

82.5 KB Created: 2021-04-25 02:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4b7a14dd152481234f274ae1309479e6 SHA-1: 20443b61b75de94c513635d07b97ef13722d4a7e SHA-256: b209e4e9cd13eab886c6f8feba41216a4f6446ea73af689b57cbe208e9deb312
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 links, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains a title related to 'unfaithful husband' and references wkhtmltopdf, indicating it's likely a crafted document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=what+the+bible+says+about+unfaithful+husband PDF link annotation
    • https://lalexitadonu.weebly.com/uploads/1/3/0/7/130776325/2758416.pdfIn PDF document text
    • http://zifixoribe.scienceontheweb.net/yamaha_hs8_subwoofer.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/tecnicas_de_redaccion_con_ejemplos.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/kuzobuzexapilatexusaxoj.pdfIn PDF document text
    • http://lukunezevowazol.sportsontheweb.net/fixotaporedalagal.pdfIn PDF document text
    • http://mepanawabopod.22web.org/bob_s_burgers_season_6_episode_guide.pdfIn PDF document text
    • http://sidawiw.iblogger.org/alimentos_transgenicos_tesis.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/zadamefilufot_woxamibojefed_jamazuz.pdfIn PDF document text
    • https://pusiwemesezupob.weebly.com/uploads/1/3/5/9/135962263/liwulun-pewufonujotuxav-wesejepuvimof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/refivudomuj.pdfIn PDF document text
    • http://mevumum.epizy.com/wii_emulator_android_games.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/64580103424.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/a_royal_affair_movie_480p.pdfIn PDF document text
    • http://niforubuduxema.epizy.com/80997751253.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/ap_5131_manual.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_7caa91d93f694f219e6255bfbd1f897d.pdf?index=trueIn PDF document text
    • http://fiforeru.atwebpages.com/95503394758.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/4298721301.pdfIn PDF document text
    • http://butorinowu.myartsonline.com/lopebe.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_25105c7ddf4e41baaae12a857f84513e.pdf?index=trueIn PDF document text
    • http://rosikelakijanup.rf.gd/kotagotebajam.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_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 5156 bytes
SHA-256: fb24c32c59abdd08cd5dc190e8b5f71d20d2aff8bd686557028d431bc0dfa5c5
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 16840 bytes
SHA-256: 03a27939bc32cfbcce738f19d4e57cd32f1551d64421f3559f3113c6fb99014d

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