Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9b462a9aea800b…

MALICIOUS

PDF

97.0 KB Created: 2020-11-17 16:24:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 979fef70aec114c8982d9a8523d517b2 SHA-1: 1cbfd4a0037eaf81dc174df914fb3ad7b623d26e SHA-256: 9d9b462a9aea800bc265e9d5e473569048d71b39e8dbadac2100f46b86d305f5
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to potentially malicious or spammy content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/123?utm_term=chem+lab+answers
    • https://porimejonawi.weebly.com/uploads/1/3/4/3/134368737/946666.pdf
    • https://toxekemugig.weebly.com/uploads/1/3/4/4/134484635/67e2372f3cbbc.pdf
    • https://lajezufil.weebly.com/uploads/1/3/4/6/134636359/9846281.pdf
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5fa4ec8868f18.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d8a98c9-d604-4211-8dea-39b97b2b0f34/lidupe.pdf
    • https://uploads.strikinglycdn.com/files/390c4d8e-06cc-47f0-b9c7-32de527cc71f/nukasotoz.pdf
    • https://uploads.strikinglycdn.com/files/8f3a6fe7-6d9f-4ae3-91a9-9f812b743a6b/depuwinelevudoriwufe.pdf
    • https://uploads.strikinglycdn.com/files/fc544cdb-18a4-4fcd-aa62-29b455b0e09b/80316826489.pdf
    • https://s3.amazonaws.com/desekusoxi/black_clover_episode_14_english_sub.pdf
    • https://uploads.strikinglycdn.com/files/9b915445-8978-465f-8369-b7fef990bbd9/40193695624.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001285c.bin
bb3843a64ddf085df6428ae62cd356d5f421b3f894d0ab3947d43c5f078c37d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 5060 bytes
font_01_sfnt_off0001396c.bin
40add8de912844462564107e21d4173e9d323fa16222c5e708278ce6c0ae9976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1396C 11804 bytes
font_02_sfnt_off000161cc.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161CC 16204 bytes

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