Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c3e2256d98d40a…

MALICIOUS

PDF

76.6 KB Created: 2021-02-24 08:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 37200c022a09c2b6f996b7946c222932 SHA-1: 7837e12faa5926eee2788b92a74f554cec0cae69 SHA-256: a4c3e2256d98d40a6c95e2dcdb6b94ea584b1a4e34da2661fe9baf9b29bf637b
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 domains and are likely part of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to an 'Alcatel one touch phone instruction manual'.

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://bologen.ru/wb?keyword=alcatel%20one%20touch%20phone%20instruction%20manual PDF link annotation
    • http://koolmaxt.online/sebastian_junger_tribe_ted_talk4jb1m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446650/normal_5ffc58ed307b9.pdfIn PDF document text
    • http://zerkalo-fugicar.website/thomas_more_utopia_citationivm34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fd26627a0fda.pdfIn PDF document text
    • http://gouliwer.online/65139207689lvhf4.pdfIn PDF document text
    • http://techanomic.com/368855289983xufp.pdfIn PDF document text
    • http://blablablacar.online/wajinijilikusssp.pdfIn PDF document text
    • http://rankingcoach-apps.com/andrea_camilleri_books6l05f.pdfIn PDF document text
    • http://mazafaka69pussy.online/captions_for_instagram_pics_2020j2veo.pdfIn PDF document text
    • http://return-0.com/ford_raptor_pickup_truck_priced4k6o.pdfIn PDF document text
    • https://garururukipu.weebly.com/uploads/1/3/4/2/134235121/tavoketev.pdfIn PDF document text
    • http://saratov.ooo/44001980805vfqyq.pdfIn PDF document text
    • http://pozuliruz.iblogger.org/phone_call_history_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pawutewitozi.epizy.com/meeting_agenda_templates_excel.pdfIn PDF document text
    • http://lulanojejol.epizy.com/adenomegalia_cervical_pediatria.pdfIn PDF document text
    • http://ligixuz.rf.gd/crude_oil_inventory_api_report.pdfIn PDF document text
    • http://zazujipediwa.rf.gd/adobe_acrobat_reader_dc_app_for_android.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_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 5164 bytes
SHA-256: 8dfc6cf212cda945c289ad7e42efd5b9c7c5c3fe54d8aa88f2885ac9894edd3c
font_01_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 10984 bytes
SHA-256: c361593d892c0570622a9792ca54678293db1e63b3c87d463e09cfe245c7e1b0

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