Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc85d1935fd0166…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 12:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb32970fa9e8527d9c2f662f0bea9a3a SHA-1: 52b3179cb36b05aaf5b278d3fad8cc5b8c6f690f SHA-256: 7cc85d1935fd01665d7cc0cf00654941984cc7edb3c3133ec09abffe1277b9b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to disposable hosting, characteristic of a link farm designed to obscure the ultimate destination. One heuristic specifically flagged the PDF as a link farm on disposable hosting, suggesting a phishing or malware distribution workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4f3c5141---pogexoxaganiva.pdf In PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/31539563789.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/talemagamefug.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/liledazipajenenarawexok.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/lifepovejusi.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/sivadikaxezejonoke.pdfIn PDF document text
    • http://bibikid.ru/upload/vojowukutonelabovevibofag.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/fexofarediwikatex.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/ninokirirokiru.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/gadejilajigotelim.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/18187159324.pdfIn PDF document text
    • http://offerparts.com/upload/files/96578455496.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/13732243018.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/81812449674.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/50528411199.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/gagupeselifeguvilow.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210909104809.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/rezelewajajiwil.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/xujowopixumom.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/99498304755.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/99766463740.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/zegonitepafuzivavozun.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/kawawevuzotopu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/43985080838.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9ac1d031---jedezozaput.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/808152689.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/45712471377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=heart+gold+rom+androidPDF 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_off0000c413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC413 17872 bytes
SHA-256: e3a91bc7f1b40d4714ac47909fa6e643e1ea396a666fd7ae54e31f719cc7fb11
font_01_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 10416 bytes
SHA-256: 0b29253c2bd53ef8b440a47ff34dd32e12e5309a1d556e11bb12e9d5caffb872