Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77660d80e9d6e7f…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 13:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60ff610848dd8f07d9cd91b85d6da72e SHA-1: 48225b26387880b310811e0465909ddebe1e2605 SHA-256: a77660d80e9d6e7f792c717fc1b5713c793abef4e8cac8e02f78dc8dad857c6e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with critical and high severity heuristics indicating it is a phishing trojan. The presence of embedded JavaScript and a large number of external URLs, many of which appear to be link farms, strongly suggests the document's purpose is to redirect users to malicious sites. The embedded JavaScript likely facilitates this redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://irlanc.ru/uplcv?utm_term=pokemon+go%2B%2B+by+ispoofer PDF link annotation
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/23494389998.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a3c5b3f3edaf28179c7c3dc586de1c61/gozunix.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/lezipifibenobo.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/gukakukivitajuk.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/gitugudoxigafuzu.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/45013634979.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/gabegoxuwen.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/88154120682.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/jotarilinebolaxenibipen.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/17091735229.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/8053679926.pdfIn PDF document text
    • http://k1a.ru/images/files/file/75620556755.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/bususes.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/jugajedozulateremeb.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/66246998009.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/84446249327.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/97065779636.pdfIn PDF document text
    • http://capri.lt/userfiles/files/wupevilapojakunagod.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/lagijususegomikar.pdfIn PDF document text
    • https://12shio1.com/contents/files/rebaxugoxod.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/sarotivabiwur.pdfIn PDF document text
    • http://sql110.com/pic/24466207510.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_off0000ab87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB87 10744 bytes
SHA-256: f91b3ffc5a0b45824d228307d710b74ce3b9a480c16d2fc79757d259d208f501
font_01_sfnt_off0000c400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC400 15404 bytes
SHA-256: b3650d9a05b9e91e6f9c9444845828e901632bee83f16e3a7b1e8ffc59469231
font_02_sfnt_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1