Malicious PDF — malware analysis report

Static analysis result for SHA-256 e925996818eedd1e…

MALICIOUS

PDF

97.1 KB Created: 2021-09-18 12:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 51754b4f06a3499cae8bbdc0a452d8ec SHA-1: 8289db605e78c14919c3698f3484a77b44ec171b SHA-256: e925996818eedd1e1c6c49bb4131e27b75d9948ce6120e8b6c19bda085412a22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous links pointing to various PDF files. While no scripts were extracted, the structure and numerous external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nwatchonline.net/userfiles/file/82021338853.pdf In PDF document text
    • http://bluebossa.pl/files/file/gozusizojifanitogavazi.pdfIn PDF document text
    • https://oasis-travel.ro/files/75252826015.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/bugazodamutowovuj.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/66940088016.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/jabiletuwuxofudu.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/gogowanenu.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/paratuzaju.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/figoper.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/38764833442.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/zisojimafidoro.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vowopasome.pdfIn PDF document text
    • https://aokman-drive.com/d/files/duxisidulil.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/lotogu.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/86382180152.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/vofolipekunifotijozedoki.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/joduxexalemavobovakut.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/20238321471.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/xanik.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/dinujawaseku.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/8299286302.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/69183252275.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/55ee07c8bd0071799fc6eb9a46837190/71436702172.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/29408681973.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/tiponurorelujebuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dragon+ball+gt+super+android+17PDF 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://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_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 19496 bytes
SHA-256: 2f434868f4a283675516291f14ae5e4825210783c402cd03c31ab7d47f568ad6
font_01_sfnt_off000148d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D7 10908 bytes
SHA-256: 1e44530898926b998efee20d496d3d3e0b3b54d624d7f4ef9941bde70970b730
font_02_sfnt_off000161dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1