Malicious PDF — malware analysis report

Static analysis result for SHA-256 8791924379bdf68b…

MALICIOUS

PDF

86.0 KB Created: 2020-11-25 09:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b31e2ffadafe45c4c6efe8d6c479482 SHA-1: 796a6758fb89f3ab6b48a733ded5dcfcf3c19f5a SHA-256: 8791924379bdf68bf5288d0d4a52ff187c3347ea29c9ffa59289bcedb521e5af
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 pointing to potentially malicious domains, indicating a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffnew.ru/123?utm_term=dragon+ball+budokai+tenkaichi+3
    • https://netiwixavono.weebly.com/uploads/1/3/4/3/134306625/66556.pdf
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5f89e45bb03da.pdf
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/xuwufirejikizoxig.pdf
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5fa3269e040ea.pdf
    • https://cdn-cms.f-static.net/uploads/4368219/normal_5f8bcc121b042.pdf
    • https://xaruxetadelu.weebly.com/uploads/1/3/4/4/134478950/26d32283f5.pdf
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/7bf01a8e81.pdf
    • https://gajinuware.weebly.com/uploads/1/3/4/5/134597963/gexabikitavoxamefuke.pdf
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5f92f326cb691.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bf4366b4-5d06-4436-aa02-a0bef0a671d9/pifetubunonin.pdf
    • https://uploads.strikinglycdn.com/files/27821d69-09bf-4162-b031-90cc6098895f/sobifovurezunovofejovev.pdf
    • https://uploads.strikinglycdn.com/files/9baa5ec1-2e51-45ce-a4aa-09817b14d338/chicken_wing_dissection_lab_worksheet_answer_key.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb27.bin
a34f6133241b0e53c3cfe1f853016e916a3d7180b6d3b88390408fd04f35e9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 2888 bytes
font_01_sfnt_off0001056b.bin
3163a68df124c56ebbfa3cc6b9ba5f3f804c175e3ff3a2f421a29aab956e2f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 5272 bytes
font_02_sfnt_off0001174d.bin
17334e1020ec954b284611b2ab3b423ea36e19671c3212e3c1d6fbcac5f7a859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 11048 bytes
font_03_sfnt_off00013c5b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 4324 bytes

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