Malicious PDF — malware analysis report

Static analysis result for SHA-256 4911e4c6c90fc643…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 20:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c1889f4c133f51748844b7614522c7e SHA-1: f1e25a8350cdf9c7554d61aae5f28a97a6de028b SHA-256: 4911e4c6c90fc643d1882a0728aa3e2e340a91a7d026e3e3bd39fe978e595245
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous URLs suggest the document functions as a link farm, directing users to potentially malicious sites. The embedded URL `https://pixomot.ru/uplcv?utm_term=watch+iron+man+1+online` is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=watch+iron+man+1+online PDF link annotation
    • http://tuzvedo.hu/elemek/file/bojurijurowutumadas.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/851551463.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/93721254621.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/078f9a5c94bd586d502e2ba242492142/dizozarezonosa.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/rarufogawaximozox.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/razinadodotuxe.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/zogomozajigowadijipiniki.pdfIn PDF document text
    • https://uangraja.com/contents/files/gopokozivo.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/rusobutevow.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/83856777018.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/basixipikiribagika.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/diferijepederukij.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/85971396677.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/47663359257.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161314fe16b046---sanobe.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/zinegixinowipasa.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/julivabesenoxutu.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/12716839208.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210908074849.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/rufuvesuj.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/99263112566.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/20749654728.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/56415611569.pdfIn PDF document text
    • https://remini.hu/userfiles/file/55227234226.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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 10372 bytes
SHA-256: be5554e1f445e00eec4b62b97f896635fcd11e0fbd0af58b319577efb82bfe71
font_01_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 17824 bytes
SHA-256: 2e4fff8f6556007af9474239b952afb63a5e6840b8b09444610b28cd11747faf
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1