Malicious PDF — malware analysis report

Static analysis result for SHA-256 7320ede2ddfbea0a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 10:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 191b1d9c16f1819fcf3cc4cb8f985797 SHA-1: 50e0ed0499f8b9afe43566621e368d399aa71551 SHA-256: 7320ede2ddfbea0aca7f0320b685e0e4a6a77007eb2996ac1bf80580cea06099
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://trumoi-khutrung.com/upload/files/30800440678.pdf In PDF document text
    • http://ymmicro.com/files/files/25688248573.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e73ee1ea16c82d68c5ff3226f188074a/likilesupezagugavaniduras.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/sugenabivokavekuxi.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/61725521860.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/80700336993.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/72123959716.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/razixo.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/dowonofedig.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/vopobonoxepix.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/20050266433.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/tupanelivufexipowuxonoxev.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109090646444159.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/84135437949.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/57861088195.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f128e60fb37d8e10c469f6ed70ef5df7/latifijeguwemojoxepuzuk.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/majad.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/lurupivenivajuvanug.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/pavasowexul.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613faef14f017---tirobefalafav.pdfIn PDF document text
    • https://claudiodituri.it/uploads/11511474979.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/rixoledobul.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/jexosisimavoniwiw.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/56769051162.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/21751305747.pdfIn PDF document text
    • https://alev.az/userfiles/file/66582808236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+uninstall+updates+on+android+appsPDF 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_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 10564 bytes
SHA-256: 1f7e378d43e24426fcce83b2f0e7a26ebb80b99051829453e530650fb5d6a444
font_01_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 17916 bytes
SHA-256: 279c3b789ed7fbf406deebee097fdb681250aa076ac3bc78d04513f25d2c620b