Malicious PDF — malware analysis report

Static analysis result for SHA-256 822c9ffe0cae869a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 12:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c41187d151285bc23537f485ebc8e0cc SHA-1: df179c52ca61c0e70c65acf114f8731226a44e0c SHA-256: 822c9ffe0cae869aee992d64c341cd895f7efa8f54b987ee077092523c2cdd37
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous disposable URLs, suggesting an attempt to redirect users to malicious sites. The presence of many distinct hosts and the 'utm_term_redirector' flag further support this phishing or malware distribution vector.

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 http://jr.ac.th/ckfinder/userfiles/files/kikojudizetaxepojuraxi.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sulurozavudewaloxikan.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/jegibet.pdfIn PDF document text
    • https://vientangluc.com/upload/files/tabofavevuzovumazelepizer.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/40842815755.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/guwibizazozexujunalu.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/nutibidavobaxezibivotobe.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/dozofukid.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/tigedotamipuroronifazeki.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/wuxanilezojibizuzori.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/denutotejomi.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zegibovolubokugokij.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136be147f94f---3404142309.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/98320119466.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/jitoratef.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/nokuvivipasoguziziji.pdfIn PDF document text
    • http://trovas.com/userimages/77820241761.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/roradekedujalem.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81430203902.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/87619496325.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/lenarotixakevofilaveseso.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/55692329192.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/85910956350.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/90921262421.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/ruwutalajotupora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=anuradha+de+practical+microbiology+pdf+downloadPDF 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_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 17824 bytes
SHA-256: f944f02f0d254ad0eefd0204517dc16c47bda14e69949ad0ad7278baaac35737
font_01_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 11320 bytes
SHA-256: 6b906416ca3443914565a284fef5cf56eed49cc2917458776c9eb17734a04291