Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24a2d6ecccd90b0…

MALICIOUS

PDF

72.1 KB Created: 2021-09-14 11:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e108c40d682dfa8f241c0886c13d3b33 SHA-1: c23d479e8e7d59378bb3a5d5cf2a4b9474efb754 SHA-256: b24a2d6ecccd90b0266d0ce0fd12799cf1320842afad504b92ba400b2f05d7df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://allytemp.ru/uplcv?utm_term=bajrangi+bhaijaan+full+movie+with+english+subtitles+download PDF link annotation
    • http://tano-cable.com/d/files/zekoganenimolasadobajup.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/66344666206.pdfIn PDF document text
    • http://beijingteye.com/upload/files/98441523415.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/61933513523.pdfIn PDF document text
    • https://shibbirs.com/media/files/30198022291.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/64742147914.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e2ac7f4f5d341bf73d41f0ce5ef2d5ce/fegeleberigud.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/butibalakidilolebesazewaj.pdfIn PDF document text
    • http://ativn.com/upload/file/vijupozuperinusajakafij.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/97678554529.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/53806572373.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/7537399480.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/guxusolupigutubekumekipu.pdfIn PDF document text
    • http://airmon.hu/images/files/65430737861.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/pirunowafi.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/wepasekemotunavinevebeg.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/1584893058.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f8ed87f0---fokukubomebudewiga.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/58677641226.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/sukekujoxesuwalemetizo.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/47952000375.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/wadegesujipugu.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/nopokovulune.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_off0000b33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 17680 bytes
SHA-256: 4e9e8f5b75faedc2e100b2a9ee21ffd93223b023f450d41cb531ddb104a8478f
font_02_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 11376 bytes
SHA-256: 28320086fa6b1f476f0ef69d31341ac9a38078fe4f48f7e7bfbbc9303a4a5cab