Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf52899a8a7d86e…

MALICIOUS

PDF

80.9 KB Created: 2021-05-05 15:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 248285519dad3aa7af1734d0abdff2c8 SHA-1: 568738908d60f6df4ba0d56db38ae397e8be51d4 SHA-256: ecf52899a8a7d86e34d0687e9a9b22163e3808503f9215dc76b4078f431d181c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to improve search engine rankings or distribute malicious content. The primary URL, https://ponafet.ru/strik, appears to be a lure for downloading printer drivers, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful sites.

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=hp+laserjet+m1212nf+mfp+printer+driver+free+download+windows+10
    • http://bijakolonan.iblogger.org/vedosafuveboba.pdf
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/nojapefivawagidoluv.pdf
    • https://molilavavabofu.weebly.com/uploads/1/3/5/9/135989114/8833001.pdf
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/9499092.pdf
    • https://lixavoje.weebly.com/uploads/1/3/0/9/130969842/97693e2f37e90b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d8708a3-c862-4dac-90bc-2bc1aafbb252/senior_software_tester_salary_uk.pdf
    • http://tegemikewik.rf.gd/text_to_speech_online_free_no.pdf
    • http://taduxefi.epizy.com/acidose_respiratoire.pdf
    • https://uploads.strikinglycdn.com/files/77dff9d6-7fdd-41ed-bf8e-e0f0e4b21d3b/51678151923.pdf
    • https://uploads.strikinglycdn.com/files/8b267ccd-5e55-4857-b544-44dfb6761f19/97887249957.pdf
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_3bb2d27e675b48f59a9ba570e734dff2.pdf?index=true
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_a90112dd44de483c99e71c86bba6d774.pdf?index=true
    • http://bebezira.epizy.com/97772222871.pdf
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_f08d4f6d773a4679aafb475d2b552e20.pdf?index=true
    • http://lezipador.epizy.com/aluminium_extrusion_plant_project_report.pdf
    • https://uploads.strikinglycdn.com/files/27d45929-7192-4d85-9466-a0b1d1ea4e3f/49923961363.pdf
    • http://pamajaxa.epizy.com/ge_wireless_door_chime_19297.pdf
    • https://uploads.strikinglycdn.com/files/cd04baeb-e012-4507-ae14-afd70c106c74/how_much_does_an_airstream_basecamp_cost.pdf
    • https://uploads.strikinglycdn.com/files/f6b32171-f219-4f60-b170-003e5b00c476/vanity_fair_outlet_mall_crossville_tn.pdf
    • http://zusiwuso.epizy.com/bruises_lewis_capaldi_piano_sheet_music.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_off0000fc7b.bin
b92baa759ea7e0e4f05fe7df13299fd2ae5f2718e315a0b55c18c85c8f0f1bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 5704 bytes
font_01_sfnt_off00010fe5.bin
3c556dab8785e8fc31898399e6cc01ba46163cfe368aebba88fe51e9cc6e364e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 11140 bytes

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