Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45ddec906cc4ca5…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 21:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2bc68128e91febf29502a1ae6b67036 SHA-1: a6f812a20a6d737da41c1599a52d5348484be264 SHA-256: c45ddec906cc4ca5c547ac09a4dfedc8ac5ca009278ae62f303e475a4d8414c3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://av-jet.ru/userfiles/file/feripogubulidos.pdf In PDF document text
    • https://unique-u.biz/images/uploads/file/zarakotesafezabodaxawemob.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/22576433360.pdfIn PDF document text
    • http://baove24h.org/upload/files/68345044882.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/6023412607.pdfIn PDF document text
    • http://wjcopy.com/upload/files/keledopidile.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/6323663135.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210905153015.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/nadifu.pdfIn PDF document text
    • https://conrays.ru/f/data/72777273504.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/41392394773.pdfIn PDF document text
    • http://mylodge-naoshima.com/susojife.pdfIn PDF document text
    • http://furniture83.com/upload/files/katozaditerape.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/dolobifexoti.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/kasiku.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/19502278747.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6d2ead1c7da43efc8df95a767b2dd5e/ginenadifajobibaw.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26325633529.pdfIn PDF document text
    • https://laps.pl/userfiles/file/55786989895.pdfIn PDF document text
    • http://napiarsaigh.com/images/mulexeba.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/kajasizudugunazumi.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/74822330810.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/87071743494.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/zububarukijenokasipumam.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/gigazomugopigorozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=assassin%27s+creed+psp+isoPDF 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_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 10380 bytes
SHA-256: 11466482cb17bd470f44efaeb5c6e6916f66239e43ddcc8ddff56305886828db
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 18088 bytes
SHA-256: 5f02fe42f2d8d45e7aa09d3f4eb6bf65b80d67ad19f6efca532d9983cb51b1bc
font_02_sfnt_off000125bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1