Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0231e049c63d6a…

MALICIOUS

PDF

94.2 KB Created: 2021-01-18 15:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3fc1a60ac63e99fe60585a6dc57896ba SHA-1: e96c6e302449a0062760cf70f21f3f1b868dd0b4 SHA-256: 3b0231e049c63d6af71ca3aedec6c18b7978dbe63ee330ee08f3eee1b3df7941
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a large number of external links, suggesting a link farm or distribution mechanism. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs point to various domains, many of which are hosted on Weebly or sqhk.co, indicating a potential campaign to drive traffic or distribute malware. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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/123?utm_term=stickman+madness+game PDF link annotation
    • https://cdn.sqhk.co/jabakujivim/hdjficL/drum_pad_practice.pdfIn PDF document text
    • https://nezuwiwobitedut.weebly.com/uploads/1/3/4/6/134600585/aa11ae.pdfIn PDF document text
    • https://mabulibatelirip.weebly.com/uploads/1/3/4/5/134597637/1309481.pdfIn PDF document text
    • https://cdn.sqhk.co/zojisixu/zZJggaq/sonomu.pdfIn PDF document text
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/laxanedefasifewada.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/jejhijs/99487380201.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/vadoposutinodewelol.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/botany_notes_for_ias.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/62869359036.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/how_to_type_report_on_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/93055791900.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/kitt_voice_box_app.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/dnr_fishing_report_mn.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/saturated_steam_table_by_pressure.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_off00013218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13218 5296 bytes
SHA-256: cc7698e5c74ded29a7304349ad0785f8a1aa039eee5af861993270015898906d
font_01_sfnt_off00014411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14411 11796 bytes
SHA-256: 4580afc81f62e5906490b52671f909723170ddb1b8c40b58d737cd41727dadc2