Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85e50984d95906c…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 13:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bba35d5430163bdc178d34c3eb98d4b SHA-1: 2b2321e84ac28e1ca6fc59cb5eb9f746dd25a244 SHA-256: d85e50984d95906caabeab066da26f754e03437fea5b942cd7b181193be5fae8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded links pointing to external websites, suggesting a phishing or malware distribution scheme. The presence of these links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=happy+new+year+full+movie+in+tamil PDF link annotation
    • http://kommunikator.nu/demo/userfiles/file///40318860614.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/7537914575.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/15045671059.pdfIn PDF document text
    • https://mkontroll.hu/File/nutazuwerebanogilonepilum.pdfIn PDF document text
    • http://lagrupacio.cat/file/kamodenunugaxowulugorus.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8e66a2846---zusinosemot.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/lapajabipilewuwopozo.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/40298768248.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/53594388139.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161510ac838aea---98062537502.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/55782978557.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/68046859801.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/7768149182.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/tijoxefapopimiwimu.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/86119838848.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/94371845332.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/76325380613.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-23/20210923162027940286.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/71552695187.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/66149005190.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/60254910419.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/likadetofiga.pdfIn PDF document text
    • https://exclusivelimoservice.com/ckfinder/userfiles/files/zitunedu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/73998423458.pdfIn PDF document text
    • https://hujanuang.com/contents/files/fakasaluvaje.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_off0000b086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB086 10708 bytes
SHA-256: 667020f49bb72520e5baa21ad76fd560da011d02557ec155f2613c8a4291c22c
font_01_sfnt_off0000c914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC914 14340 bytes
SHA-256: 184c506bd801f6ff63b2f811bb2b15635ae686a32d43c701801eff48e25ab4bf
font_02_sfnt_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1