Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae0ccbcdb70f2f9…

MALICIOUS

PDF

72.6 KB Created: 2021-09-28 12:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8600558351a088e65d1a843527f3cb5 SHA-1: 9357dcbcd162d7da3aa98f381e7014bf44bfe432 SHA-256: cae0ccbcdb70f2f99e989e37c17a2b15609d18bf84fa5193cc87e687bfbf350d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, indicating the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://urdu-hadith.com/survey/userfiles/files/xojulojipaduka.pdf
    • http://kyanite.tv/userfiles/file/62342251215.pdf
    • http://tech-sub.com/userfiles/file/18421464508.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/9676018975.pdf
    • http://podwierzba.eu/ckfinder/userfiles/files/42211431261.pdf
    • https://smartech.lv/sites/smartech/uploads/documents/files/63508873903.pdf
    • https://mar3ol.com/Files/files/2403728175.pdf
    • https://bostaninsaat.com/image/files/bosere.pdf
    • http://zkqzl.com/uploadfile/file///2021092120372134.pdf
    • http://unseretochter.ch/images/file/kugururijigadudelov.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/gulokosomugivevebejexuvog.pdf
    • http://www.stemcellhairclinic.com/files/files/9012847457.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/20818343838.pdf
    • https://pannonfinanz.eu/editor_up/9249690041.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/61988201315.pdf
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bevakumedakikov.pdf
    • http://caphegiabao.com/upload/fck/file/lefiwososidod.pdf
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/73461824061.pdf
    • http://jungam21.com/upfiles/file/1631030387.pdf
    • https://rails-bg.com/fckeditorfiles/file/19685050274.pdf
    • http://traktorpulling.de/ablage/userfiles/files/gadiviwemegugujonilipuvu.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/22040243569.pdf
    • http://kamnitikamini.si/upload/files/26051061564.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=call+blaze+and+the+monster+machines+2018+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b335.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB335 16792 bytes
font_01_sfnt_off0000cb4c.bin
66416dafb37b32869a507a7674eb8b680c695980217e1860a0471d99f6b71bcd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 11604 bytes
font_02_sfnt_off0000e697.bin
949292726032f196080e41f8db8b24f830f0c1d35e39a95f682f79efbc5d4ce0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 17860 bytes