Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27188bcafadd79d…

MALICIOUS

PDF

81.8 KB Created: 2021-03-20 22:07:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d06a7c3b911c878c7c90e50b669c1888 SHA-1: e9bdf3d2bd5459a7d05ee1d498434aebe53a7804 SHA-256: f27188bcafadd79d6defa95da4240535a79b4ba095fcb87365cddfc4503cba13
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is malicious and a phishing attempt. It embeds a URL that leads to a domain known for malicious activity, disguised as an application form. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://gimoguvi.ru/123?utm_term=kptevta+application+form PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/528709ba-6672-4056-9a6c-8707368db78a/bigero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ce16d9-2fcb-407a-8039-2f73859a19b3/75815827561.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/43360681499.pdfIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_7f65fc26c0d0472f90468848ffc25e37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/savufanugowisidizut.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/plantronics_c054_headset_not_beeping_when_phone_rings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42efe1ac-0cb4-4d05-af9b-5e6028d10e8e/laboratory_manual_in_physical_geology_9th_edition_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2372360b-8d9a-486f-9311-f585c922342c/mekajefamevopijasatefo.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/ejemplo_de_dialogo_entre_dos_personas_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/kibew.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/61735374978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49330f62-ff66-4ffe-9d14-a813a506e7d1/goxuvaxabovadolil.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_ce681c0f1dcc46609afb573c88643563.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca113ae-5fb8-4eb7-a3a1-0f174143a415/advanced_sql_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f210054c-53b2-4ca7-9b33-f3ec9d598279/best_money_market_interest_rates_in_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/10553218794.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/gasapolekemekijofojiwat.pdfIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_d7bf99c722d04170b32b0dce44145e91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8189b844-9e98-4580-867c-215423284dc0/gesufapip.pdfIn PDF document text
    • https://359ea524-acbf-40a7-8d58-ee96a8f10bc8.filesusr.com/ugd/ca2e76_c59505bbe3f249cca60fb052a68d6fd9.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_99652ddf97304477a031427435afcc88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/nice_guidelines_sepsis_2012.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_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 5012 bytes
SHA-256: 947f47fd0e9b2ea4fea110c8e9893db53a294f6b40e1a98f3735a53394aec6e3
font_01_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 11488 bytes
SHA-256: ad31a3b3de100cc0d33b80150d932aae653fbbed601a6b1c716d8350640de658

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