Malicious PDF — malware analysis report

Static analysis result for SHA-256 339912f9ac99d0ae…

MALICIOUS

PDF

77.2 KB Created: 2021-03-04 05:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 04b20a7877631110f771316bbabdd46f SHA-1: d7778b1938d72691f10ce9d412861bdbf1f4a38a SHA-256: 339912f9ac99d0aeeae1e6d76be8fd204f568acc4fe8cb9f60d002a78061121f
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains numerous suspicious external links. The presence of a 'Security software disable instruction' heuristic indicates a clear intent to bypass security measures. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://golowaki.ru/strik?utm_term=dd+wrt+wireless+bridge PDF link annotation
    • http://trycabinets.xyz/895654034311qaol.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/92732618117.pdfIn PDF document text
    • http://sandiego-podcasts.com/mipelamugofugoh7j.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/25511513020.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/desoridej.pdfIn PDF document text
    • https://gegiritofizupog.weebly.com/uploads/1/3/4/6/134644009/woluxisu.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/81842089991any6h.pdfIn PDF document text
    • http://usesalle.xyz/9096114216o9ews.pdfIn PDF document text
    • http://ionatr.fun/what_can_you_eat_on_the_daniel_plan_fast7v9w1.pdfIn PDF document text
    • http://olipaka.xyz/ilpa_guidelines_3._0cfnqr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomuper/96883045086.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/83763581696.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/dont_change_the_subject_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/trabajos_de_amor_perdidos_resumen.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/acer_aspire_v5-571g_bios_key.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_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 5012 bytes
SHA-256: b6d1b263db49e9c71350804c0ec16eed353ce1ceb83bd424818e942353768c66
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 10580 bytes
SHA-256: c96964252b1a6da98074a71393e1a9ce873a1274595a8418e79c0f85bda48ee5

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