Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a484b40d7d66ebe…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 19:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8faa1af1f46143bee2d44909a23936d3 SHA-1: dcaca939b0158437ed331a4dac6d626b42be3002 SHA-256: 3a484b40d7d66ebe94de97ac278add7226aaef630803df56be7b8d180ac09933
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting and are structured as link farms. This suggests the PDF is intended to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=delete+google+voice+search+history PDF link annotation
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/43030911216.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xoribetazikasewewero.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/soramuj.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/wugale.pdfIn PDF document text
    • http://tcihk.com/userfiles/jijulifazemakol.pdfIn PDF document text
    • http://kccmaul.com/files/files/kirebudowiputifelol.pdfIn PDF document text
    • http://exima.kr/userData/board/file/1872082255.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/74701752173.pdfIn PDF document text
    • http://www.toptehnik.si/images/40600001366.pdfIn PDF document text
    • https://halkum.rs/files/50746702897.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/gilowarepevomukevipa.pdfIn PDF document text
    • http://fygl.net/uploads/file/060019376005.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/42e093.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/7428470188.pdfIn PDF document text
    • http://rinsacars.com/files/others/fesajefekuka.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xapunir.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/4275901084.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417506251c2---kurusadozosakesijuxi.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/29316342152.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/85222343227.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/50338531489.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/44485045940.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 16680 bytes
SHA-256: 8928fbbf0eac21313c3aa9f38756356b280c9401bf47caf16dba0241968e6fb9
font_01_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 10588 bytes
SHA-256: 25ebe18bc3f4fb3eae1cad36bec73e5c49da0ac7ef666c83ecac7a1eb5fdb4fb