Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb100ff1b74eff53…

MALICIOUS

PDF

86.1 KB Created: 2021-01-30 01:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9a2c3eee5c6b9bee51db7dc091deeb21 SHA-1: 74745af2801ac3a142b5b73c3abf306f01b598d4 SHA-256: fb100ff1b74eff538de6d9f8d27ed04b6c02eb10ad2b669c50e8ac616157638f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful sites.

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://druttle.ru/wb?keyword=zig%20zag%20hexa%20puzzles PDF link annotation
    • http://kupivse.xyz/salutobekofabitz94vo.pdfIn PDF document text
    • https://sagerogokijisoj.weebly.com/uploads/1/3/4/6/134601402/mozatesonubowed-mejebiletir-geporexigar-duzalej.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/JWJhjii/47259164849.pdfIn PDF document text
    • https://fejuzewe.weebly.com/uploads/1/3/4/8/134883228/b0daf527f.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwufeguv/akhhehb/trick_shot_map_codes_fortnite_battle_royale.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/gvMieki/kriss_vector_22lr_review.pdfIn PDF document text
    • https://wifamiwipefap.weebly.com/uploads/1/3/0/7/130738562/6941d69c.pdfIn PDF document text
    • http://barbanapoli.moscow/woxejupemikozuvif6hyxw.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/wiremeresegikon/44878429907.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/bigfoot_200_runners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/pulse_secure_client_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/bach_minuet_in_d_minor.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/nutrimax_performance_nutrition.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_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 4648 bytes
SHA-256: e63b26dd02760351a2bdddb1ddb0fad2f96456e5d33d105393528fbd1f76c261
font_01_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 11624 bytes
SHA-256: 49ad9923307ff74e0f35d342e195138928a9ea5cd561da4004dd6b742ee3eaef
font_02_sfnt_off00013d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D70 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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