Malicious PDF — malware analysis report

Static analysis result for SHA-256 b669908bbf59b773…

MALICIOUS

PDF

83.8 KB Created: 2021-03-06 15:37:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0f9e87fb90a5365b679b2b0f9b723147 SHA-1: b35ea5fb54dbaf682ab58a650b1faf91ed5ee1da SHA-256: b669908bbf59b773281a45e17980ca874a28c54b7aa0c49ae9723cec105f2c0e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/wix?keyword=diggy+2+unblocked+games+77 PDF link annotation
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/jigovu.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/514074cefd958e.pdfIn PDF document text
    • https://zijobukevas.weebly.com/uploads/1/3/1/4/131454580/4695675.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/towov.pdfIn PDF document text
    • https://zolopopi.weebly.com/uploads/1/3/3/9/133999976/misizawerudekerirej.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/munomezopa.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/lefemabadekekimegi.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/gabekujulus.pdfIn PDF document text
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/lasefikufevuv-nulixemagib-denedunalataga.pdfIn PDF document text
    • https://fizexafotunuguv.weebly.com/uploads/1/3/1/0/131070009/dupipaga.pdfIn PDF document text
    • https://jugotazotezolut.weebly.com/uploads/1/3/5/9/135973864/lomutoj.pdfIn PDF document text
    • https://romarifekaxa.weebly.com/uploads/1/3/2/6/132683260/zufazefomanabefone.pdfIn PDF document text
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/jazaviporu.pdfIn PDF document text
    • https://bapumora.weebly.com/uploads/1/3/2/7/132740837/jubalusa.pdfIn PDF document text
    • https://mibuxinuk.weebly.com/uploads/1/3/4/7/134753888/338830eb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_4052c35a663a4a0a8a026494707182de.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_58109c5b2ad940419b1922a3cba6e707.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_2ab967f1b0cd4a90897e8dce670a3316.pdf?index=trueIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_50033c77b7b2442da72405c157d838ac.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_91f93883950648ad928963b8a3437622.pdf?index=trueIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_933b9d18a21047e1a2ecb418ed67677e.pdf?index=trueIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_bca7cf20d5bb46c591c84c8bd2d28b8b.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_e1d460aaa125469895949f7a9b68872a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 3836 bytes
SHA-256: 29eaf8c165b205e840b821aa04562681c570aeeff1ee657690e071a276e60908
font_01_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 5680 bytes
SHA-256: 5abb1ddbaae7fd2fa96c67204671ff4930636be6d144f1472e9fc748ccf9c47a
font_02_sfnt_off00011d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 10372 bytes
SHA-256: 2b3e6f45f9abf22e2d9964db205bd75be414fbb86c2c9f25f9d3475c80ceae42

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