Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4c5ca8adc4f575…

MALICIOUS

PDF

79.1 KB Created: 2021-10-16 14:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5f668917f918b1398688a59dc73cb417 SHA-1: f080a9244683c81c8e4fe4c9846e87a160333e2b SHA-256: 7a4c5ca8adc4f575031357414e1b71d822e3c26111c17136b37a7b35d901fe28
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a clipboard command execution lure and contains sequences that mimic command-line execution, suggesting an attempt to trick the user into running malicious commands. The document also contains numerous embedded URLs, many of which point to potentially malicious hosting locations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://auburn-properties.com/userfiles/files/zuxufog.pdf In PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/75009151204.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rejabuladire.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/rowuv.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/89021401326.pdfIn PDF document text
    • http://qdcmd.com/data/files/nitanojororusadoxi.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/6210449702.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/65769022480.pdfIn macro / runtime command snippet
    • http://www.euro-fly.eu/userfiles/files/53303861543.pdfIn macro / runtime command snippet
    • https://lesartsdansmonjardin.com/userfiles/file/20210907102727.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/linitetasevabujoboxexujo.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/jixabi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/88502091729.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/71204399495.pdfIn PDF document text
    • http://cbstav.cz/file/93704533762.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16169f750d22c4---bumiximuduzetawejez.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/60445590012.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/tufulonizekupo.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/38537335232.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/81828700576.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/wilogu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0662030943efcf3b6e96efd3e4fbe796/35887752477.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/telopulomotajefopep.pdfIn PDF document text
    • http://copy2d.com/In macro / runtime command snippet
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=ncert+solution+of+science+class+8+chapter+14PDF 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_off0000d138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD138 16948 bytes
SHA-256: 8af96a15c94480b4d3af69282b801ddb9e205f0c8b9d6f4adde2b2689732b41e
font_01_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 10992 bytes
SHA-256: 7f9d6cffeb7b548a0a9edbc9233ae3b59ddac098d1af805ab49ea130ff58fbbb
font_02_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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