Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a0603f00e7038d…

MALICIOUS

PDF

65.4 KB Created: 2020-11-17 07:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 560fa67d5c7868ff8b3c5967e3c72e1f SHA-1: 6fb82e4b865a4a27d730b0cb5c931088f02cf290 SHA-256: 37a0603f00e7038de91a42501379bfe79a442e2cc1526d85f6e0e3fea978522e
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, indicating a link farm strategy, with several pointing to potentially malicious PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious workflow designed to redirect users to harmful content.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=indesign+format+painter
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/2741921496.pdf
    • https://kileligujet.weebly.com/uploads/1/3/4/4/134457719/70c4162.pdf
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f8c93dfdfd25.pdf
    • https://warajepij.weebly.com/uploads/1/3/4/6/134608856/xatilun.pdf
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/bofejoxubozu-jaroga-zexevegevetopog-fivadudetiludi.pdf
    • https://cdn-cms.f-static.net/uploads/4387825/normal_5fa1ecd926df0.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/72d6abcc2.pdf
    • https://fexejolimoti.weebly.com/uploads/1/3/4/1/134131812/feguguba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nowonovege/pre_ap_biology_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/18953be7-f134-42ce-a677-36d02da2a8a8/79229844082.pdf
    • https://uploads.strikinglycdn.com/files/97a095e8-2554-47a2-a207-0cd944137324/bar_xanax_mg.pdf
    • https://uploads.strikinglycdn.com/files/dfc8583d-4d08-4773-afd5-983ac785aabe/46712750887.pdf
    • https://uploads.strikinglycdn.com/files/8d0e31a8-96cc-4bb8-a856-38d06b6eb1b1/ludedebemudivurawezamotus.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_off0000c264.bin
5b57c0e5a23ef84d2c436e0382732de1476e935287db5cf0f6021101f438dac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC264 5268 bytes
font_01_sfnt_off0000d438.bin
2c282e512b0aece114f5cc318b71dab52e6563230e9721ef18e2dd5bce610929		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD438 10944 bytes

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