Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5346afa9e169c6…

MALICIOUS

PDF

88.7 KB Created: 2021-09-16 22:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0c3769f30ab19726658c4e8930726b73 SHA-1: e204ae11a42c85818a451e9663fbef4231a874e6 SHA-256: ea5346afa9e169c604c6ec0972613ce30ba3618b0911900909d07855a5dd7736
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to potentially disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eirai.org/editor/ckfinder/userfiles/files/93200610724.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/02d7173319b23bb957b763a606a556c3/94386949705.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210908_7B749EEDF28C7E18.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/mawur.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/77442821897.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_13_59_10_3399.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/93930463666.pdfIn PDF document text
    • http://safarang.com/basefile/files/nedujefapu.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwumafawasutolako.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/zimukopofuxuxusuwis.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/dotesirorure.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/jetamexegamebibovebid.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/jefobu.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///sakaxamevukujibe.pdfIn PDF document text
    • https://salwangurugram.com/files/lajimunakasabigu.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gojozuruda.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/32612710720.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7242d2bb569b8c34cf4ebe4a058b171c/33778008413.pdfIn PDF document text
    • https://brukspec.pl/upload/file/84809265464.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/63804777880.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/58593839558.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/vojasumazuvakureweveza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=popcorn+time+2021+apkPDF 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_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 18512 bytes
SHA-256: 8afeb0d02b89510d52300b279185509ca47ab0d18ea87533c88bee8f63c3baaf
font_02_sfnt_off00013c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 10708 bytes
SHA-256: d628edd22bf23d24e70f3da125cdc1eee2478b5afc4a0bbbc065c76160ab58a2

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