Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c30359ee8bce827…

MALICIOUS

PDF

73.8 KB Created: 2021-01-31 15:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 59c874d5316f92bbfd18e9ebc22052c5 SHA-1: c4ce370f0b51c1f9a544c52a466a3441d58d45a8 SHA-256: 2c30359ee8bce827f53c62f3c570ec17e859cfd17e01cb0f258f610b01382142
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary URL suggests a lure related to crossword puzzles. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://leonvi.ru/wb?keyword=crossy%20word%20word%20link%20crosswords%20puzzle PDF link annotation
    • https://cdn.sqhk.co/zidezofa/rSOgcie/bigeri.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/jfiehez/zukuxejuvikolopiguxaguvi.pdfIn PDF document text
    • http://naturebiolog.space/28417207927gt13h.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/2KjdU62/toca_boca_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/9KgdOXQ/hello_neighbor_hide_and_seek_parent_review.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/EprTShg/tidufokilirajikaku.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/Mjbl4I1/wizejezufatavik.pdfIn PDF document text
    • https://nulixosur.weebly.com/uploads/1/3/4/3/134311840/4358148.pdfIn PDF document text
    • http://effektzhizni.ru/sevubukuwusumozitixawuj8odnc.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
    • https://s3.amazonaws.com/biwuwukesazef/bhagavad_gita_17th_chapter_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/ar_ageing_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/pigikorofekebalapoxureset.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/google_spreadsheet_text_box.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/virtual_meeting_smart_management_case_study_answers.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_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 4992 bytes
SHA-256: a4bf810c821ce1ae407180463e83a0e72d7d03e5e9f4b528e2f0911bb85e4a7d
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 10172 bytes
SHA-256: 67d8e8a68c023740b2c6470339739f518630923bcc96141e7845b8ce2a095e44
font_02_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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