Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e282b7b279fea45…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 12:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0482e1e019ba2b2e9b31c577d8048924 SHA-1: b7cc49d59eb9fc851e57961dd29c68acd036ea10 SHA-256: 0e282b7b279fea45556331d68cc534904e199bd04a1e19970de50dbf51f26348
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or malware distribution lure. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting an attempt to obscure the final malicious destination. The PDF structure and embedded URIs point towards a common technique of redirecting users to potentially harmful websites.

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 https://medvor.ru/uplcv?utm_term=where+do+i+want+to+go+on+vacation PDF link annotation
    • http://hamyarsanatco.com/ckfinder/userfiles/files/16494894692.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/85467932862.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/33582024327.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/jesobusejivideke.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/zafamozolexugubo.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/52117614621.pdfIn PDF document text
    • http://jawarakreasi.com/file/4027003613.pdfIn PDF document text
    • https://asiapharma.la/files/files/logiregeke.pdfIn PDF document text
    • https://parfumzone.ro/files/file/biledifudazuneguxabewuz.pdfIn PDF document text
    • http://exim5.hu/_user/file/49803880666.pdfIn PDF document text
    • https://diphong.com/uploads/bazipivetepoloxojej.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/29223684372.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/8425256628.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/dituvoduf.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/vazasamatug.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/witinijolezifuw.pdfIn PDF document text
    • http://toroisg.com/public/images/files/23369290717.pdfIn PDF document text
    • http://e-hematologica.com/users/file/9310115644.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/misewigemupejifaduvaxam.pdfIn PDF document text
    • http://maksimetall.ru/files/fazasib.pdfIn PDF document text
    • https://alpinashop.bg/files/jasuw.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/zepamogijujadumivorosa.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/xubutalasofozovubogosawe.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/30871838296.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/28/file/46903256561.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_off0000b21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 15856 bytes
SHA-256: 774f27ff3798541d9873ba230c78d1737ccd445ff1948473255e8f48f4b60eab
font_02_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 10580 bytes
SHA-256: b2b7bbf3d303c9befb8721727c5309b72d0bcff9436df68af2fca82ba857ef21