Malicious PDF — malware analysis report

Static analysis result for SHA-256 233c2e5ceb3ece48…

MALICIOUS

PDF

83.2 KB Created: 2021-06-01 13:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a6747e3edfbd92fae4978aea3dbfff0 SHA-1: dd6e94be2ca16e0af5d30d30e09e5482b471f6d6 SHA-256: 233c2e5ceb3ece48b4eb60f3783ab0872156fe97ba8064b0481c74b403082845
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 PDF files hosted on Weebly and other platforms, indicating a link farm for distributing malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs and the PDF structure suggest an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/pbw?utm_term=libro+dinamica+beer+10+edicion+pdf
    • https://tozobaveje.weebly.com/uploads/1/3/7/5/137501006/fudupanuror.pdf
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/9a85ac91.pdf
    • https://vumevomuw.weebly.com/uploads/1/3/4/3/134335884/502976.pdf
    • https://cdn-cms.f-static.net/uploads/4452846/normal_604781ebdef81.pdf
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/6803142.pdf
    • https://nogusevufofe.weebly.com/uploads/1/3/4/5/134525370/5c38f102e7d4.pdf
    • https://pagukusiko.weebly.com/uploads/1/3/4/6/134631218/5115139.pdf
    • https://cdn-cms.f-static.net/uploads/4452389/normal_603dc2e4641be.pdf
    • https://ledomibab.weebly.com/uploads/1/3/4/8/134858948/ziveza-vamoxazafoxigu-gopipofotenitoz-jinepob.pdf
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/cda502.pdf
    • https://rosiwefoves.weebly.com/uploads/1/3/4/0/134018148/nanevogotizizaragiw.pdf
    • https://fupotepalakeb.weebly.com/uploads/1/3/5/3/135351483/mavimat.pdf
    • https://modurofeg.weebly.com/uploads/1/3/4/3/134376635/sumatidav.pdf
    • https://cdn-cms.f-static.net/uploads/4374968/normal_6041b80ce9022.pdf
    • https://wofibenozoga.weebly.com/uploads/1/3/5/3/135321696/8c4ac.pdf
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/8414742.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mikabipi.pbworks.com/f/3564824969.pdf
    • http://wiwedano.pbworks.com/f/how_to_put_hook_on_rod_stardew_valley_switch.pdf
    • http://pevozowo.pbworks.com/w/file/fetch/144424260/34855601878.pdf
    • http://bamedun.pbworks.com/w/file/fetch/144457704/80976491584.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_off00010219.bin
9a7b94a39d90d3c250d3404dcc1db3258177841032233cdff91b2abda0e465be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 5368 bytes
font_01_sfnt_off00011449.bin
2bc756e307cb02c4ece509a3e4243139055e91b228b2ce56a61c57ff49598efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 12824 bytes

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