Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ff558212ca8c23…

MALICIOUS

PDF

68.4 KB Created: 2021-09-18 19:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9153589b54b81e67d24fcc6d644f1deb SHA-1: 81f79750e8697c6ef3dc3d748b0cfad1b09c599f SHA-256: c2ff558212ca8c23b4dfb6a0c7670d483a63df86f51828d2b37a4ca11c6370b9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, with multiple embedded URLs pointing to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 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://coretry.ru/uplcv?utm_term=download+insta+square PDF link annotation
    • https://profm.hu/files/file/43204505526.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/lotiroge.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210907155845.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/moxidogonedizofoguresodu.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/87076455327.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/kidulu.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/wedizitoxuxekisosiputube.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/pifupiwuxijebevezu.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210916_A5360EC7DF42CFED.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zovezojuzat.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/tipaxenuj.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/favokomuxetarera.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/gusetarefaxewetepux.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/lojixopuwuwewak.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-12/6e070e7515c014980d3ddbe90c88410a.pdfIn PDF document text
    • https://campermagazine.tv/public/file/8449980195.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/katifezasirakanoremokurim.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/komarexozoserijilu.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/68293429583.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/90591427532.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161368fd020121---ruridon.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea3c9574da---xawudojefurobodino.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_off0000b165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB165 10576 bytes
SHA-256: 8b73a56e29cff8d2d726ae5367ae0c74734e1edfb7ed41e057a6c0725a8a0547
font_01_sfnt_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 14028 bytes
SHA-256: 75599e8e15920c46368f3f4af157f54028ac5e43fc96c4fe122247cf2a69e151