Malicious PDF — malware analysis report

Static analysis result for SHA-256 333facecb6d54979…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 21:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e8a0a04eda8d64ea011768fb2282a14 SHA-1: c1e73231599eddffa53dd8b124479f161c6e682e SHA-256: 333facecb6d54979f42ed6a0b91d6fce2681cd4c84657624924034330978c1f6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm on disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://birdwatching.sk/media/file/43424128460.pdf In PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/dubija.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/galabi.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/zoxasobogizakub.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/gapepuwemitawixusi.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/57339713935.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378cd373e51---43812276054.pdfIn PDF document text
    • http://brukbet.com/user_images/file/76298947099.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/fuzifodarovigebowerewobez.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/90794930090.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/lerevurokaxuruginavobavov.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/91729716668.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/97003421415.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/8gs9ia6fvnh0n9no8rtn202vs3/61421246582.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/48952498772.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/95923155198.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/82749852671.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/giwupobidimip.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/fepifobos.pdfIn PDF document text
    • http://talesma.com/E/file/457478244.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/34765073029.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/kitirogajerixemesezububar.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210903_FD29B068B32F9F0C.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210910114719_493037156.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/lijade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=flight+simulator+for+android+free+downloadPDF 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_off0000d0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 16676 bytes
SHA-256: 36447d9b112882f9833ee20edfbfd767727dc2b6e60c84dac6c51db8c613f3f9
font_02_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 10964 bytes
SHA-256: 7311b432c1bd3379afce2bdd6db58cc69895adc8eaced509e38b9fe22fcc2475