Malicious PDF — malware analysis report

Static analysis result for SHA-256 f045bf95260653b4…

MALICIOUS

PDF

88.5 KB Created: 2021-10-08 12:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 71d39b66f80a7379f1870aca3d3eceab SHA-1: 26438eb9c1e11fc1f9176300c5d4cf57ae3ebda9 SHA-256: f045bf95260653b41c04112cd3dcfe43f731449bc93fff5e32b60c03eeb88003
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable domains, suggesting a phishing or spamming operation. The embedded URLs, while many are unknown or benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://innotack.com/userfiles/files/93391733743.pdf In PDF document text
    • http://alumcity.ru/userfiles/file/walimomujiguku.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/zabowo.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/filozijemegeguvotimofat.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/214583140061436c470b8f9.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/ziperaxutavaborobirunejir.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/81554065686.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/kisuviwenelowaxazugal.pdfIn PDF document text
    • http://identik.hu/editor_up/71531518790.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/xirorizigabas.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/43005827077.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/godorumiluvenovuromiwezi.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/42713199552.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/51301302152.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/wikizireginabekasarotasi.pdfIn PDF document text
    • http://terrietanaka.com/library/files/86836296478.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/bawazatawebogubizaxo.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/67900695386.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/zimigil.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/iammi3q9c2nqbgjm1eco8f0ibe/23153367582.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/xuvepalolelanivob.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/4860364321.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/01f4768696c446cd15e78e457a278260/99073835216.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/14525625676.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/16012599562.pdfIn PDF document text
    • http://yuha.be/_files/file/rufevodevabitirabomuluzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=definition+of+the+word+thoroughPDF 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_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 20100 bytes
SHA-256: 41f2a9090ef375031dd1b5adfa6f0c4a2a94791ac2a41a03336d36aa185ba9d4
font_02_sfnt_off00013c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7D 10444 bytes
SHA-256: 62ef2e4e45e6301c653fa2161c1539ed42dc684bdf62071273e15a7739f24a3a