Malicious PDF — malware analysis report

Static analysis result for SHA-256 0577902dd826937b…

MALICIOUS

PDF

68.1 KB Created: 2021-02-14 08:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fc469516b4d25bf001ca03bc06d3ad9a SHA-1: c6befff4b53c00487adea9b93e0c65c94f091c81 SHA-256: 0577902dd826937bde4fc47dfab1a38ccfead13442fe319e5464d7a6537cf3d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wb?keyword=crossword%20answer%20for%20two%20masted%20sailing%20ship PDF link annotation
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/zirativem-xurevusokajubel-nukitimuka-moxopovaso.pdfIn PDF document text
    • http://tulotipokumubo.iblogger.org/nurexiguzutijume.pdfIn PDF document text
    • https://tenivutod.weebly.com/uploads/1/3/1/0/131070705/c23ada5ddce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380858/normal_60006b97bcd63.pdfIn PDF document text
    • http://limowoduramu.iblogger.org/luxobutunabolatemaliwot.pdfIn PDF document text
    • http://teniran.22web.org/ferocious_cup_cheat_sheet.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://banitazivi.epizy.com/template_undangan_khitanan_cdr.pdfIn PDF document text
    • http://kojokiguxan.epizy.com/norusigoxujuse.pdfIn PDF document text
    • http://pumakiwidali.rf.gd/zanojexebuxirazifo.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/masexusupojutakutur.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/gosufurepija.pdfIn PDF document text
    • http://julisanusifi.rf.gd/tesagoxegofurunufedafu.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/20-_120_leveling_guide_wow.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/birkenstock_sizes_guide.pdfIn PDF document text
    • http://gerevukome.rf.gd/ap_calculus_slope_fields_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/laminator_sheets_walmart.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_off0000be8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8B 5356 bytes
SHA-256: 70fe2583ee8e51607db701ea175b9bba4cf90ab2727a457e3d660f3dfc606cc6
font_01_sfnt_off0000d0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 10740 bytes
SHA-256: c28ce914e2017aae99f3081a43a3da704677acfe1603ea01f702f897b9d6d0f9
font_02_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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