Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb51432f5c390632…

MALICIOUS

PDF

79.7 KB Created: 2021-10-16 00:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd62d32aab9a219c25148756f8e140d3 SHA-1: 20c97b0fdc515e0c67a042852da49f2a08982944 SHA-256: fb51432f5c3906327d0f1f6ac73ae3a2b519464b8914eefcfd52985682fc9a22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs that point to a link farm, a common technique for distributing malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates the presence of a link farm on disposable hosting, increasing the likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2b69f6cfe605f0116f0082211857c0ea/noduxezaneporevifepexoja.pdf In PDF document text
    • http://0vote.com/ckfinder/files/niwedekujigetubu.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/xokolojesezesax.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/5112493459.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615169f3c9859---96313576881.pdfIn PDF document text
    • http://scpt.it/userfiles/files/19956059701.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/vinojazexasamupa.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/fevifuwan.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/xubaweba.pdfIn PDF document text
    • https://luminex.pl/upload/file/93710979802.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/solotepusepidadazivirosi.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/40133822450.pdfIn PDF document text
    • http://fitviewer.com/files/file/78371376970.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/39160274769.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/simasisagosekovupegijir.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/23064545350.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/12557937376.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/gegixepefurekasar.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/14979418135.pdfIn PDF document text
    • http://chinahongji.com/d/files/zuvixafesadasojes.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/56372231529.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/tufidipafagorux.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/22477215101.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/58649282593.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/lateluvuwolosepasorij.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/tgwjJlsMqHc/uplcv?utm_term=jesus+fed+5000+with+bread+and+fishPDF 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_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 17232 bytes
SHA-256: 4e601fed7423a5ed2f01b5ff985ab491f7b420caa32e4f9b9e796a1eb04339af
font_01_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 10860 bytes
SHA-256: 0cf21aa36f3d2caf7408b7872aff238f56c8035d230a498be0ef8fd5091d106b
font_02_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1