Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44160bdb714b8a5…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 10:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12441a7b490d0289815a5aa9358128b6 SHA-1: 844fda87dd0ec893801a042f1017e0ee5e0038d0 SHA-256: c44160bdb714b8a580c2b236782702c782f362d2ba49c44f35a9ba49f3191d78
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDF files, some of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to obscure the true malicious destination. The embedded JavaScript and the nature of the links suggest the document is designed to trick users into downloading further malicious content, possibly related to the 'wipelocker' tool mentioned in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tugrabilgisayar.net/resimler/files/89574078955.pdf In PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/lojutadefoxigarozudim.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/wutabim.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/nokazuza.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/barinetokatorino.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/922736834598125c03d8b575a15ac14f/48421693524.pdfIn PDF document text
    • https://tempegaring.com/contents/files/3784851070.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/55032267289.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210916003637.pdfIn PDF document text
    • http://plise.org/userfiles/file/juborapijimef.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/gerunatujobixe.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/xabiboberawadewofat.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/13033537514.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/waxulirudufi.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630484022.pdfIn PDF document text
    • https://lordoptika.hu/files/files/loritevorofafuwo.pdfIn PDF document text
    • http://unibox.lv/files/text/39514113035.pdfIn PDF document text
    • http://ergakiland.ru/files/files/35806677116.pdfIn PDF document text
    • http://moristas.com/userfiles/files/wapapad.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210911_082912.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/90352455675.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/30029478764.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/vixudexivapozajodufavelen.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/42250529128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tool+wipelocker+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_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 18144 bytes
SHA-256: 711cec46713746576923b8a8de81fa87f97d05f4f6f7195d9835fda7643f2be7
font_02_sfnt_off00012a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A19 10380 bytes
SHA-256: b6cee4017e4248cc44d9b67449b2b251933bf85adb5d28466529a0c862f528cc

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