Malicious PDF — malware analysis report

Static analysis result for SHA-256 55685a60206ec804…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 03:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5529ad86884b1b662b64b5b5ceb29dbe SHA-1: 5477df18b31a7298e8272faf6b52bfb395e687d6 SHA-256: 55685a60206ec8048ee32f140fe327b87e89825ac4fdb19ecdd53cbaf25be26e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste content into a shell, a common technique for executing malicious commands. While no scripts were extracted, the presence of numerous unknown URLs points to a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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.
  • 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://iphone-odklep.si/vsebina/vumetefaparisugozizosok.pdf In PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/togugine.pdfIn PDF document text
    • http://totoumi.jp/upload/file/44273815817.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/28206550564.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/garipumoxa.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/notomuxisixe.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/10435273309.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/pugurijikonelipubem.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/56220515148.pdfIn PDF document text
    • http://hijoin.hu/editor_up/nurafuwapuduvo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a2e860c06---kevabexir.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/93845140054.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/96950625709.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/5245350715.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/81179745065.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/pabukufasunafefol.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/47882866039.pdfIn PDF document text
    • http://iviltra.lt/images/files/60981365000.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210916_055305.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec23a4e139---95302159732.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/farimuwipuwunupop.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/12/xopiwodozi.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/pubosud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=m3u8+to+mp4+androidPDF link annotation
    • 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_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 10760 bytes
SHA-256: 33e96d3f09a8d2ef4d37a5e527ac3e74bcc0ceff8f287ea596a1b02e31aa6854
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 17848 bytes
SHA-256: f551bf3e935aa7c384b94c58c7c7653cd9c61a786cd2959785aeb7af9ced5670

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