Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e5fa6bdcb9a119…

MALICIOUS

PDF

71.1 KB Created: 2021-09-30 10:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c93d459b1ba6c8617cdf8545769efcc1 SHA-1: 5e023ea7ea3c3ac530186a32fbb83c8de857f1fc SHA-256: a7e5fa6bdcb9a11921019142fb5b9db7ad8997f90333f30121bf3286b12fb543
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests this malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate a high likelihood of malicious content within the PDF structure.

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://tovicetour.com/FileData/ckfinder/files/20210930_7F59DB1173A98DD6.pdf In PDF document text
    • http://machulski.com/public/file/sufebal.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/23685959618.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/supaporubiwalixegog.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fowujefepuje.pdfIn PDF document text
    • http://merwepizza.com/upload/file/61713333222.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/61284624964.pdfIn PDF document text
    • http://alvitraders.com/files/98908951432.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/32273729004.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/posajajidod.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/19060772231.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/21406409133.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35054989150.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/luwagerodeno.pdfIn PDF document text
    • https://durimawar.com/contents/files/bawolo.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/putesodivafolaromebojiju.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/xakiwogowomovel.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/56354100602.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/kinipul.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/wuvewogade.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/14912456616.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/fexud.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-23/images/files/notadirozupapizinape.pdfIn PDF document text
    • https://network-italia.it/file/2122279135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+earn+credit+points+in+cod+mobilePDF 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_off0000b215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB215 17256 bytes
SHA-256: a2bbfb885ea987fe08d72d71e8276b6a39bf11893d6de85590a8acd7bd4554d4
font_01_sfnt_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 10892 bytes
SHA-256: 6d1c803daa1c4d80efa3be63d3c05a7bd3e0f2d377ba9021d5c0c74fd2c04202

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