Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc693a090b530a3…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 05:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 279154bce1f86446c714be0d5696264b SHA-1: a1c59559da46d7375b8a801fa8be38470e054998 SHA-256: fbc693a090b530a3d56bff666f682cd9330064ab3bbe6212f7a7fa0f7903a746
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links strongly suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://sushiyaslo.com/uploads/files/nalewogixo.pdf In PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/37056605877.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300b78cfd6c---vodeditix.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210927_AF408688FAA04677.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109091501286797.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/35651169320.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/55378229143.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/furagaguluzewasek.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-26/20210926162912305819.pdfIn PDF document text
    • http://foodchemsino.com/d/files/73300301067.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/zogikexex.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/39824758486.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/3734154046.pdfIn PDF document text
    • https://12waktu.com/contents/files/webegumukafe.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/60833963449.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/28602738053.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/revupuzodude.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/53918463347.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/gorusafijejum.pdfIn PDF document text
    • http://hiniceshine.com/upload/xamixuruwazefene.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/13983855156.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/pofunudujibilupibok.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/fetamodonusimiwamagekaliv.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/78114486607.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/50032592042.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/rinoloxegufavozubaraxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=3rd+most+populous+countryPDF 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_off0000b57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57E 10576 bytes
SHA-256: c4103df0cb009e9307639b08517f9390f66ef7c5225175f47034c923ea91ff22
font_01_sfnt_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 16824 bytes
SHA-256: e3b4cbcbe45cc91099f9f54a18dfdd684de09f5ad5204d407d2415cce6c90fff
font_02_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1