Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a0895f309e9228…

MALICIOUS

PDF

77.2 KB Created: 2021-09-11 23:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 928e3971f949a71be16a0b8b3094376b SHA-1: 71520537389cab3b26614bddda588d749c008189 SHA-256: a6a0895f309e92288210e1bef975805c7f98afa44fac5a35fe86b1a5ed854f1f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mirai-kankyo.com/userfiles/files/kexapuzubenen.pdf In PDF document text
    • http://www.kymkarajok.net/tiedostot/files/14654345196.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecae61f25d---garipigarimafosed.pdfIn PDF document text
    • http://master-vin.ru/files/file/valofe.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/losovumufofosadasuwofe.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/85514696950.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/12454001463.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/24486123009.pdfIn PDF document text
    • http://trivio.it/userfiles/files/10039102542.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/75795092846.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/14856967928.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/35692336804.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/ximugap.pdfIn PDF document text
    • http://guowangcable.com/d/files/37260838445.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d7e58078---foxezudozidid.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/299683462.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/kerokapavotesubenapa.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/27489208418.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/19868729857.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/20212445289.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/gelutojugozaguzanire.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/modibe.pdfIn PDF document text
    • https://revive.fashion/upload/files/zarexobedopizebuxez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+paid+apk+for+freePDF 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_off0000ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 10404 bytes
SHA-256: d7b1a4a246558059a9db901a02981695acd4403870869ecbdcaa4a56085ece8e
font_02_sfnt_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 16528 bytes
SHA-256: 454ad3c11036fdfe9839f25f687597e6ffa532b55459ef6f32ac84247f928b9d

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