Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a41532e445c060…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 13:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 564d7f91664aee1d62efed2bea8ab33c SHA-1: 4a2d5766c6c8cecd48a067fe9ee3836440ca8c9b SHA-256: 65a41532e445c06067e6c55d3f09ff76c961c72302f2c5ba63002e5f4af31064
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's used to deliver a secondary payload or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://khojedu.net/userfiles/file/kikogamavezafafosowafov.pdf In PDF document text
    • http://innospectrum.eu/hirlevel/file/57230792160.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/23983397202.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/2473271107.pdfIn PDF document text
    • http://edeins.com/userfiles/file/vibelifaj.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/gevutexutebifixowuvufov.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/18727644400.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/tovejazibef.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/lofakib.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/71725954745.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/61128816242.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361c55274db---60784434346.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/dijavekekonadujokizi.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/xajazekufuxejenimo.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/zamixudilikowixajer.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/79630871814.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/15214350948.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/lexufifulavatemafiz.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/nasolotegobiwovapik.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210907054042.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/55429474892.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613695dc20daf---gosudadapefokulisugulafo.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/28994658468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=apk+launcher+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_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 10164 bytes
SHA-256: 4f4869c1a919d228e9cb6e9afa809897292ef70784b8d710ee92cb313b971d43
font_02_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 20572 bytes
SHA-256: e3812cdddcc6d62227e4a5a6c745f9a4300a09058523995346ada4a60af65ca4

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