Malicious PDF — malware analysis report

Static analysis result for SHA-256 0957849c8d89093f…

MALICIOUS

PDF

74.5 KB Created: 2021-02-11 14:19:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 031088b2a545ebfad71a23cafaddbd38 SHA-1: 5fc6e8300cadb4c18f1256c8d0f1c50a26feb317 SHA-256: 0957849c8d89093f032be16acc123296ff7a66c2574aa0b8bc2b1d7ebafa6a8c
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with the primary one being 'https://leonvi.ru/123?utm_term=strike+force+heroes+3+unblocked+games+333'. This URL, combined with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM', indicates a phishing attempt to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=strike+force+heroes+3+unblocked+games+333 PDF link annotation
    • http://lnstagram-copyright-confirms.com/direct_and_indirect_speech_exercises_for_class_7_with_answerscbj78.pdfIn PDF document text
    • http://xesifavaner.22web.org/audit_report_format_doc.pdfIn PDF document text
    • http://vermono.site/zopaxizipekobojopuzeguveoeji6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366666/normal_5fca45d9f267a.pdfIn PDF document text
    • http://awpmode.com/synonyms_and_antonyms_for_ssc_cg15qkm.pdfIn PDF document text
    • http://yewes.fun/53805428346zljhd.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/namugaxaxem_jowumanetededi_jomat.pdfIn PDF document text
    • https://dekukosozo.weebly.com/uploads/1/3/1/0/131070054/kixinadomume_jegipew_ruvepebiromenu_pafix.pdfIn PDF document text
    • http://artrosil.xyz/wonuza9z6xl.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/zanojenamowopase.pdfIn PDF document text
    • http://bigowet.xyz/linear_algebra_for_iit_jam_mathematics1k97n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xiwaresijo.epizy.com/phylum_apicomplexa.pdfIn PDF document text
    • http://giwitevezupe.rf.gd/zubedoxenixole.pdfIn PDF document text
    • http://wilafavibu.rf.gd/29794677494.pdfIn PDF document text
    • http://meganajaxovitag.rf.gd/gulurepefidib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 5788 bytes
SHA-256: 4e72d98fb9e0a4b6c5a85ee1f0461a86c6b792cc34656b6222c8eed4ea705b70
font_01_sfnt_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 11108 bytes
SHA-256: b5b97c07468ee78588e0fc81ef5c7473b395390af5be2b073739de9812e3c004
font_02_sfnt_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f