Malicious PDF — malware analysis report

Static analysis result for SHA-256 8107874ff6d22ffd…

MALICIOUS

PDF

69.3 KB Created: 2021-10-13 17:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1d72d9e8d7bd4a8d0278f68509fda22b SHA-1: 5a8d0e03a8d486b4c613d226775834e8f861199a SHA-256: 8107874ff6d22ffd92ffd92cafd48d9b2e09ac9197f746e66678f5c74c268c04
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure with an image-only design and a click-outward action. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://jotelek.hu/files/file/solotavakufoketozuwajug.pdf In PDF document text
    • http://plafondchauffant.fr/img/user/file/vebowuwojadobedewupisej.pdfIn PDF document text
    • http://abwrva.com/uploads/files/pajis.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/36468362915.pdfIn PDF document text
    • http://prompol.com/media/file/zaxil.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/23339055745.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/lolozagovufenusu.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/98573119727.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/wizaxugutejoxujelitobifi.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/vezidofujer.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/zufusomokefujijanabebun.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131626a5d4db---123461180.pdfIn PDF document text
    • http://indah-education.nl/userfiles/file/19429948914.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/tanetewijeg.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/7486785677.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/88252641042.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/68408076944.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/konizubibuzomemotediwefi.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/25758851741.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/36287907394.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/44f8e00ccc9ac3bb4b7748b1e7b06894/56167738326.pdfIn PDF document text
    • http://soc-in.com/data/media/files/gapegesu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=answering+why+you+want+this+jobPDF 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_off0000b309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB309 14176 bytes
SHA-256: b151f41f992374088a8dcc9ff522d35970c95b43852bdd37e4b55a9940dafca5
font_01_sfnt_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 10892 bytes
SHA-256: 7d6f09856d8b0b0600b26fe1626e75f333de9ac325e5cc9bda186968dd3ffb97
font_02_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1