Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d645c70510e25f8…

MALICIOUS

PDF

75.2 KB Created: 2021-03-16 19:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 242469e50647f33405742eb56365a07d SHA-1: d1e855d713fa717d2448ed92b186f817f4f85f70 SHA-256: 9d645c70510e25f820abaa3412571017d0f3a1cac1d47e4e50e5e96998f90da4
164 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URI pointing to 'ponafet.ru', suggesting a phishing or malware distribution attempt. ClamAV also detected it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence indicate a malicious intent, likely to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=cercle+de+la+forme+porte+bagnolet
    • https://cdn.sqhk.co/kinuneba/jcGZhdQ/mizifoxewajaj.pdf
    • https://melekutiruj.weebly.com/uploads/1/3/2/7/132740408/7b3b22.pdf
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/giwidonivewi-lovokewiw-rudenux.pdf
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5fdc1e464e263.pdf
    • http://timelessdecorum.com/raikes_bears_price_guide7vq90.pdf
    • https://cdn.sqhk.co/letiludixo/jbZtTxe/dutch_exploration_and_colonization_of_america.pdf
    • https://static.s123-cdn-static.com/uploads/4382962/normal_5fc8dc7d1dc95.pdf
    • https://static.s123-cdn-static.com/uploads/4366949/normal_5ff432c4a8710.pdf
    • https://cdn-cms.f-static.net/uploads/4492536/normal_601228b600aab.pdf
    • http://paksorond.xyz/peter_pan_and_wendy_actorsiriu9.pdf
    • https://static.s123-cdn-static.com/uploads/4382197/normal_5ff4c1de352ab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2ed91eda-ecbf-49e2-a9a8-5e7dd911b4d5/transcripts_of_carl_rogers_therapy_sessions.pdf
    • https://uploads.strikinglycdn.com/files/60a99c12-b865-42d7-b92c-c7aaea5fe737/what_is_solution-focused_therapy.pdf
    • https://uploads.strikinglycdn.com/files/1eff0430-b0ba-4b48-b09c-6291926c98ad/38888007787.pdf
    • https://uploads.strikinglycdn.com/files/26694507-5e93-4c0d-971b-91a97afac066/spanish_classical_guitar_music_rodrigo.pdf
    • https://uploads.strikinglycdn.com/files/18139b5c-cb6f-4205-bd04-ef2e52ef75e9/new_moon_cafe.pdf
    • https://uploads.strikinglycdn.com/files/eee3a6ca-60b2-4b7c-a66d-374c9127040f/prince_of_thorns.pdf
    • https://uploads.strikinglycdn.com/files/0f293252-7c3e-49a1-8a34-990f2096af3d/how_to_gain_weight_for_vegetarian_girl.pdf
    • https://uploads.strikinglycdn.com/files/5c9f9045-7a5d-4839-a7cb-13d04ff1f1e1/44917549848.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_off0000e908.bin
20a415531f7bb0259074e9f15f497b529a6469148897d604969c5ac6a33ae9c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 5340 bytes
font_01_sfnt_off0000fb1a.bin
2c687423728285864bf89fd65e3163474a93df007956545b741ffe58b70d3d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 10668 bytes

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