Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d33de1dd585d477…

MALICIOUS

PDF

75.3 KB Created: 2021-04-16 17:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2167edc0d34d1ce664a973c8a2a60669 SHA-1: c5a71399c1280fc47dad2e6475fd80884fad795a SHA-256: 4d33de1dd585d477b9ff7426bdf84ea0992ebe289c8cebbaf705cbf208d2e86f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'lozipotod.ru'. The PDF structure and embedded content suggest it's designed to redirect users to this malicious domain, likely for phishing or to serve a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=que+es+la+ley+marcial+yahoo PDF link annotation
    • https://nulivuxod.weebly.com/uploads/1/3/0/7/130776854/5d307c20f4e6.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/74532486502.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/aijjaWr/58081558762.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/98dc1d0133.pdfIn PDF document text
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/razado_suginobeg_piverexusodim.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/jhhijhj/37218549268.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/rjdjagf/sebipopib.pdfIn PDF document text
    • http://mifuvaxikibowi.22web.org/pukorulibexowun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0555a27f-73df-48d9-8e89-b07584d86e45/ragesanituzupikowomazak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9626392e-41c2-49dd-8522-00c05731e860/rulikedefiwoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8324e226-f1ec-4823-9431-c396aac8468c/mibez.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/wojawofubudupozepi.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/31760208770.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/74491255404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34b5786-e7c9-4f1b-b63b-1a8eab07e31f/mvc_interview_questions_2020.pdfIn PDF document text
    • http://midupebuk.rf.gd/jotutewupirilopezadajuri.pdfIn PDF document text
    • http://sivopob.epizy.com/28351499490.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/2665304496.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/meant_to_be_free.pdfIn PDF document text
    • http://nuzinigezabab.rf.gd/necromancy_spellbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fcd295-a578-4d0a-a9ad-145bf51cc6f9/36793308831.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_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 5204 bytes
SHA-256: 03272531e75651e675dd63e68c19c51e130509b6d04a1e8ef401dd7db298762d
font_01_sfnt_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 12088 bytes
SHA-256: 3eaccffb8edaa173638e36c8b16bb41e899ed073363198775f6b8dddb12984ed

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