Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb46f38b4536d910…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 05:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 212949de2b2e7b1b51c8c030b7638c67 SHA-1: 6b0d210f72edd4a66e5f3d5899790a90cad88f6a SHA-256: cb46f38b4536d9102a56e5555ee3eb786ac8a2135f983ab1718d631fd6b9d3d7
214 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's a link farm and lures the user into executing commands via clipboard manipulation, a common tactic for downloading and running further malicious content. The presence of external URLs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://queure.ru/uplcv?utm_term=copy+data+from+locked+android+phone PDF link annotation
    • http://jmyhship.com/uploadfile/files/4741940959.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/fojefovuvatifizitup.pdfIn PDF document text
    • http://i-physiology.ru/upload/mewukavezakefimaxukif.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/19010350889.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/94539359884.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613b938d1c2fe---42647720387.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/66892378118.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/74669952884.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/jelezekepibivakajuwa.pdfIn PDF document text
    • http://e-sheremet.com/img/90118024145.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/vojupumazotojevejanosole.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/ruriposimupek.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/gekigasixibiravozuz.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rufatewuvokapitiniz.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/62643440181.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/69008370109.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/tesilid.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/24416748067.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/tajavunajixigari.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/7444124722.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/wipigibibowelemiwabo.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/68367068707.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/33580068830.pdfIn PDF document text
    • https://oalysa.cz/ckfinder/userfiles/files/wusivabasifiwovarojepip.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bad1e944ec---tuxunodedus.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/49943492396.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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 18648 bytes
SHA-256: a1106a4c308ab0aaea25043c8e03a8d12710789599d34beec61643409a0747ed
font_02_sfnt_off000129e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 10952 bytes
SHA-256: d5242ac5cd0b689413147e2fa930cff54bdb88e2ec863d7947ce6861356a85c2

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