Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a3de29b7bd8628…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 23:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aacd151a488a48caa77a2a40caba5cf5 SHA-1: 5a5018cbaa495b8f3b6acca7b942b32ea95dfd23 SHA-256: a3a3de29b7bd86288d54e6e1a72b269fa78327bec6034d440d276b82da4101b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of these URLs suggests the PDF is intended to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://laborke.ru/uplcv?utm_term=portugal+vs+france+today PDF link annotation
    • http://yas-center.ru/userfiles/file/zanoronupuwuvamerer.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/85725293613.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/viteb.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/75201029764.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/gawinubateboguna.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/luwixomefifimoboj.pdfIn PDF document text
    • https://strechybenesov.cz/content/baguripij.pdfIn PDF document text
    • https://ptogel2.com/contents/files/16905026515.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/78561273592.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/xubuzukukig.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/sowivunalov.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/rumupozevupuruwuv.pdfIn PDF document text
    • http://net-marketing.hu/images/files/16392803071.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/defoli.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/rufukumuwujaba.pdfIn PDF document text
    • http://telecycling.info/files/file/76372500094.pdfIn PDF document text
    • http://ilovestory.com/upload/file/35827587623.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/67037310435.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/s48n1u424b2nlc578lltvpubhb/96147928267.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f89e9d4e41---japolidulilevarekupoga.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/nikiguj.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/ropikezad.pdfIn PDF document text
    • http://pinxedien.net/upload/files/libuwujanezikowinudagom.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/89253317192.pdfIn PDF document text
    • 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_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 10840 bytes
SHA-256: a6847ce4376b8dd6b7c6f8913b94a68a38810d1a87829de22795772cc44af241
font_01_sfnt_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 18512 bytes
SHA-256: 5c31b1d1649fbccb79441edc9aff7ab76fe0dc35e218136f4aac87b4e3ca293d

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