Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9120e6f42739e01…

MALICIOUS

PDF

87.5 KB Created: 2021-05-18 07:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b607bdcfc6e1b5ee8d93e61be666e4eb SHA-1: 9862be488d5a1ad8efa84d754bbaa3a90187ab18 SHA-256: e9120e6f42739e016aaf6a4bbe2d367b3db872be37b1b24ceb7dff61f9d1b6b2
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 of which are to other PDFs, indicating a link farm designed to distribute malicious content. The primary malicious URL identified is https://jacksth.ru/strik, which is likely used to redirect users to further malicious sites or download additional payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=how+to+clean+homedics+warm+and+cool+mist+humidifier
    • https://fupakukenig.weebly.com/uploads/1/3/4/2/134234610/8b15b3da3bf9843.pdf
    • https://gixinizolovuz.weebly.com/uploads/1/3/5/3/135348456/wisuwo_zolam.pdf
    • https://pimesawugure.weebly.com/uploads/1/3/0/7/130776266/a107136.pdf
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/fuvilibakamov.pdf
    • https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/3463721.pdf
    • http://ruwulabosubev.iblogger.org/53853837716.pdf
    • https://rogakaroguw.weebly.com/uploads/1/3/4/5/134517982/5980281.pdf
    • https://wibawewema.weebly.com/uploads/1/3/1/3/131398479/wilezid.pdf
    • https://xinozujo.weebly.com/uploads/1/3/0/8/130874257/868a9c56de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c6e010a1-710c-4b58-aaaf-7000e38d4f57/zosixenopekanazusen.pdf
    • https://s3.amazonaws.com/zopenave/24547849259.pdf
    • https://s3.amazonaws.com/topipovikapari/48821998838.pdf
    • https://s3.amazonaws.com/radubozufiwo/93173410097.pdf
    • https://uploads.strikinglycdn.com/files/7b1fdfd0-fb0f-46da-97a3-e66c097c7ec3/43549983132.pdf
    • https://uploads.strikinglycdn.com/files/be8e51f1-a7b5-4de6-ad15-1c85648d4fbe/miyota_8203_movement_review.pdf
    • https://uploads.strikinglycdn.com/files/e9c07686-3379-4fc6-9137-5bfc620581a8/ravojexagubunukisisoka.pdf
    • http://funegabupeg.rf.gd/the_little_match_girl_summary_brainly.pdf
    • https://s3.amazonaws.com/zedudo/wuzerigurelanomovawijurir.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/2020_tamil_calendar.pdf
    • https://s3.amazonaws.com/xurixado/fotesokuvabudil.pdf
    • https://s3.amazonaws.com/kegovev/zolubo.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_off00011439.bin
f78eff8aaa1eb0863f355a8728a2e75483318178d3bc952cd1dbaa7ec1e3a418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 5316 bytes
font_01_sfnt_off00012631.bin
797f8d2f64634602893b68d9c0b7f8cd90dd0c0fb77c9758d7b7c725d95dc1c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 12428 bytes

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