Malicious PDF — malware analysis report

Static analysis result for SHA-256 c122c8a4b371812f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 22:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e197d3155a76703b66c5e096ab43773f SHA-1: 58d0e7a4dcc25aa22c199e616b4f652fbb7a08c8 SHA-256: c122c8a4b371812f3bd42e796124f013d6fef000c4d41ebb797fa9d7fb8a1762
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to a large number of potentially malicious or phishing sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://catamma.ru/uplcv?utm_term=how+to+connect+android+to+sony+smart+tv PDF link annotation
    • http://dmkaudit.sk/101/upload/file/mebaxitesaninumalegizudib.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/34715682774.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/45162520129.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/sakifemapule.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/6239470611.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/sitelixafakakig.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/15085947611.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61431dbdd0daf.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/miwevina.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/kituvo.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/50290027458.pdfIn PDF document text
    • http://kme-kme.cz/files/file/zisuxa.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614059f0eb5d1---62685048157.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/vipugemabi.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/vuvofevefitegujoporanoji.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dc1dc612b311292aa26d00cf5225a191/nofitolipixavofax.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/38197133101.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/xupobaveli.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210901055058.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/wegokutufefosufezuz.pdfIn PDF document text
    • http://parilka.by/var/upload/file/sajekekuvoronekutukol.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/sipomukofak.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/14847799965.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62b85641a---botodoxudukumulek.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/lamajupetelonufotikixop.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/70172067115.pdfIn PDF document text
    • 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_off0000b1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A5 10740 bytes
SHA-256: 9f54bb86cb20e1ea8dd6098cc18f6ad65e94610fc3685eb44996b206285f6833
font_01_sfnt_off0000ca5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 16168 bytes
SHA-256: 7be2edd0da0c2f101059d9658542dc76661527d9aa62158cb39dbbe495772801
font_02_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1