Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b3f9188a120c90…

MALICIOUS

PDF

78.9 KB Created: 2021-05-12 16:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8fd515c2a0fa0b644a765ee4edde9450 SHA-1: e8a0fd3d30c9f0e86b2996ce56866867f83a0284 SHA-256: 72b3f9188a120c901daf60d3809fab59a3b399aa40368549bca92f51b52ddc35
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=how+to+obtain+my+driving+record+in+maryland PDF link annotation
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/dukizu_lenudatavef_mapox_vefete.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/cThhw3P/more_pets_mod_for_minecraft_1._12._2.pdfIn PDF document text
    • https://rixonusoraj.weebly.com/uploads/1/3/0/7/130738646/zakowafaz_laziderunukomap.pdfIn PDF document text
    • http://nowtorrentz.com/vehicle_tracking_system_project_in_android2rjfj.pdfIn PDF document text
    • http://tumibejum.iblogger.org/architectural_design_elements.pdfIn PDF document text
    • http://proita.space/comentrio_bblico_champlinyc21.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/yamaha_majesty_250_user_manualgcgov.pdfIn PDF document text
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/worepusi-kutupala-mafef-noruvegigujupak.pdfIn PDF document text
    • http://acupofjacob.com/towusipekefib21oi.pdfIn PDF document text
    • https://cdn.sqhk.co/motuwezelu/7jjjQLw/81048109347.pdfIn PDF document text
    • http://idealica-ituficiale.website/kukomobegkl78a.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/27f53c9bcd8a.pdfIn PDF document text
    • https://ladolijid.weebly.com/uploads/1/3/2/8/132816107/4199c6e193ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_3c589973c8f2440ea9cf5324a3d9e66e.pdf?index=trueIn PDF document text
    • http://redexini.epizy.com/how_to_use_sharp_convection_microwave_oven.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_df7d67fafba1455288cff20386f967ec.pdf?index=trueIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_5731c353425e4e578bd3bd6087b35807.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_ef71ab934ffe40459958a906d87c3079.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_3c5f08a235a642afad51f32be9eabd36.pdf?index=trueIn PDF document text
    • http://raredinufewota.epizy.com/74806270949.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/cbre_edmonton_retail_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/mawin.pdfIn PDF document text
    • http://wedizakur.epizy.com/dm_vasudevan_biochemistry.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_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 5436 bytes
SHA-256: 4208cd43f7494f8dcad5a1bf100b7734ecdf2cc0dc63ec253269e06e228bf1ca
font_01_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 10404 bytes
SHA-256: 4ff75d0d7a91e548a07dacd57b494b84198be3b0513fa88ff47437f7f5cc396b