Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c46891b60ee146…

MALICIOUS

PDF

90.8 KB Created: 2021-04-02 20:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ef4abba94f86b9c56598b64dd39b3dee SHA-1: 5e6204c1a31ea60a800e621bbcb2f9d761013f7f SHA-256: 85c46891b60ee146bfe232e3bd34748698c2bbafacbac506327965ca418f3128
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('vilenefex.ru') that is likely used for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=types+of+allegory+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490273/normal_601cae79de0e9.pdfIn PDF document text
    • http://jurelireroxux.22web.org/38160635321.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5feba20350f59.pdfIn PDF document text
    • https://lugilalosu.weebly.com/uploads/1/3/4/3/134314137/badae282b185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468259/normal_5fde8914ebf83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_602e43f49183d.pdfIn PDF document text
    • https://gatikewud.weebly.com/uploads/1/3/4/3/134382011/15639.pdfIn PDF document text
    • http://litagud.22web.org/gitexafepokizaxotaxe.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/lawimitevixanof.pdfIn PDF document text
    • https://paterixif.weebly.com/uploads/1/3/1/4/131454766/zifavovinodu-nolokasanebo-dotomabevaganuv-lumuroge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_60134ce4f141b.pdfIn PDF document text
    • http://lamorebeduzakoj.22web.org/9759573158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_603c3d7a3da79.pdfIn PDF document text
    • http://xesebufawif.iblogger.org/leganibipugefenugobowa.pdfIn PDF document text
    • https://bafejaligaxe.weebly.com/uploads/1/3/4/0/134018432/tepas.pdfIn PDF document text
    • https://sopetenoredu.weebly.com/uploads/1/3/5/3/135318191/negelumuvomibijemoz.pdfIn PDF document text
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/mezodime-vepapoxekaden-madod-mefalip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470972/normal_6018ee71e4268.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/5ef62c715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipuxebol.epizy.com/gapefodemegonifetuvejodad.pdfIn PDF document text
    • http://sefukapa.epizy.com/gidut.pdfIn PDF document text
    • http://loviwep.epizy.com/govofadokomadopu.pdfIn PDF document text
    • http://laraxeramamat.rf.gd/scratch_tutorial_download.pdfIn PDF document text
    • http://tisevor.rf.gd/best_antivirus_software_for_android_phones.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 5260 bytes
SHA-256: 61cea5a2e797ccd88741e0ec8b0ce4a3de0c5ebcb0d553171f5c749240943a2f
font_01_sfnt_off0001316e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316E 14488 bytes
SHA-256: cc0696162025a2ea241570392061101790e6513a97c70b0acb9c3b180202e962

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