Malicious PDF — malware analysis report

Static analysis result for SHA-256 054088b95b871b38…

MALICIOUS

PDF

67.1 KB Created: 2021-09-26 15:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc60dc53668c194aaadcbc6b3eecd1cf SHA-1: e3e88d61d74674901cca4f093d3340e0ccffa740 SHA-256: 054088b95b871b38a4a1c54d8cbe58390ed8fd3a70f1efba8477585c56516faa
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as an image-only document designed as a lure, typical of phishing attacks. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 67 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://feldmann-spedition.de/pics/userfiles/file/85470091457.pdf In PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/nunupu.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/virasesadomakopitasug.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/31140628112.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/82171921397.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/ruzidi.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/75077913787.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/56434591546.pdfIn PDF document text
    • https://naves.cz/res/file/nevulas.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/milapirufipudi.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/7231346615.pdfIn PDF document text
    • http://soupworld.de/upload/file/45676957743.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/48158010829.pdfIn PDF document text
    • http://kodemari.info/data/files/9120641447.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/kipuzunobuwosoj.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc96b5b45---2314285300.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/sagosisaw.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/62513320969.pdfIn PDF document text
    • https://citytrafik.nu/images/file/12162045463.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/mixezijovetik.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210923040707.pdfIn PDF document text
    • https://magatek.com/documents/file/jisuxekowu.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/70828960722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+real+drum+kitPDF 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_off0000ad07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD07 14272 bytes
SHA-256: 59515ec39b4f901a565577dbd81c7c755dbb7da7c1a7ffd18d45680fc8d5aabf
font_01_sfnt_off0000d0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 10184 bytes
SHA-256: e0dfe080e93d3c56d214c103a087e59efa4411c5baebda14eed35cfce704f31f
font_02_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1