Malicious PDF — malware analysis report

Static analysis result for SHA-256 055d930e67dcae80…

MALICIOUS

PDF

73.8 KB Created: 2021-10-01 07:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c7a6b325b4aaa5676107c5ac86a38ac SHA-1: 7416931ed26c3b00ec306a8a109e152752ff5e83 SHA-256: 055d930e67dcae8091930cfaa2ef51c891a04fb56009be3c6f7458dabc5348d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and acting as a link farm, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly imply an attempt to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=doo+hd+movie PDF link annotation
    • http://alhouti.com/userfiles/file/bolikuv.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/50535915390.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/60689882078.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/7870466698.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210912215902.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/77806396585.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/67578157065.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/26974897279.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/24376854341.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/xofujiwerotedujizemonu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d9e7985b---84229092125.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/12231641872.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c0661cab9791f84739b05c3bb6e016d7/xefexujowedig.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/rarunomapofapuxozatumuf.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/wedabiviraxuzijaritak.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/84044544124.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091112071573499.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/26122352460.pdfIn PDF document text
    • http://storemisr.com/uploads/files/fapusejubipe.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/95228454295.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/64029898221.pdfIn PDF document text
    • https://stvietnam.net/luutru/files/12271998373.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/93273680385.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_off0000b88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88B 9904 bytes
SHA-256: b78427f20f5351f1aae7b362367d2a8806e628d86eea8e9a37ee61898f910b74
font_01_sfnt_off0000ce53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE53 19876 bytes
SHA-256: 477b705d1303ce46a007a7fe14571a55a96e69b5565dbb1c624e164f2bd70772
font_02_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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