Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8c99135d37384e…

MALICIOUS

PDF

78.5 KB Created: 2021-03-29 10:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b8f7653471e5f1b5c499876f2747095 SHA-1: bf4efa12838b592032e88ced4ccdff9799956be1 SHA-256: df8c99135d37384e44b0dd27e3021e9df1a12cc58b17c7bac288cf35b2cd6517
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic flagging it as a link farm. One of the embedded URLs, 'https://ponafet.ru/strik?utm_term=tivo+series+3+hard+drive+image', is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=tivo+series+3+hard+drive+image
    • http://flowerport.store/php_code_formatter_library7698u.pdf
    • http://helpverifybadges.com/timex_expedition_indiglo_wr100m_watch_band8gifi.pdf
    • http://milanomoda-italy.website/852451265568vpvr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/padosumifubobo/21628517595.pdf
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_765063f75c1344129a00c61cd6c6fc18.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e00da382-e0cb-4f25-beb1-fb4739a27a06/kesetixirekaralov.pdf
    • https://s3.amazonaws.com/litunux/kowewubinibitibu.pdf
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_02dff0c306574eebb1564aa2ce73716b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c8609789-86a4-4812-abdf-ea0ab4b9c123/gabriels_rapture_part_2_release_date.pdf
    • https://s3.amazonaws.com/gofilafixu/71653047620.pdf
    • https://s3.amazonaws.com/rizezobabub/3145759587.pdf
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_6636cfc3e4e14911858b6e867ec92292.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6eca5a7e-9719-45c4-94bb-094882c40166/photosynthesis_and_cellular_respiration_amoeba_sisters_answers.pdf
    • https://s3.amazonaws.com/wofaxil/turorasuveke.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/django_many_to_one_template.pdf
    • https://s3.amazonaws.com/xakajoziwibi/56630278733.pdf
    • https://s3.amazonaws.com/benubapopikaj/38994844086.pdf
    • https://uploads.strikinglycdn.com/files/ff17397b-f1e6-4e22-867f-bc48ea617473/bameronasobujem.pdf
    • https://s3.amazonaws.com/pusixa/activity_based_costing_questions.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/romance_of_the_three_kingdoms_14_nintendo_switch.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a4.bin
427a347bc6bdbe7d5afbd0dae6d1630fd11fcc7a6c1d6b442f53599a0ebe4abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 5380 bytes
font_01_sfnt_off000105c8.bin
26e83deabec3c90ed48abf4088d5ec4987042de4d40b9668e8c9f803d0adedf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 10908 bytes

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