Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b9bb0246657d43…

MALICIOUS

PDF

73.2 KB Created: 2021-02-04 13:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 000ae2aec7ea9b0412cd18cbbdbeef72 SHA-1: 096818bf031be8ad01ba5d43afbec035ea0e563b SHA-256: 10b9bb0246657d43bbd32b5212adc00922214dc90ffbfb4b605684dcd32336f2
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 SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/wb?keyword=siti%20badriah%20song%20free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404116/normal_5fe463fe75067.pdfIn PDF document text
    • https://bilagezapa.weebly.com/uploads/1/3/1/1/131163658/9828214.pdfIn PDF document text
    • https://puvukiroleta.weebly.com/uploads/1/3/1/4/131455247/fapegil.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/iajeWxw/xebufavowu.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/akfiijt/granny_smith_apple_tree_for_sale.pdfIn PDF document text
    • https://vezifuxeben.weebly.com/uploads/1/3/5/3/135345940/8081ee43d17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476268/normal_5feb94863eed1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447916/normal_5fcad10730b13.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/MiiulUJ/75709468564.pdfIn PDF document text
    • http://besemafobekilir.22web.org/jimuvebagijesujemigofi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378607/normal_6002d448f2af5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bobupugarini.epizy.com/59914232785.pdfIn PDF document text
    • http://jutejuviwolopis.rf.gd/25656562535.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB6 5168 bytes
SHA-256: 43587470d7922e7b937eb4f2f6b8bf721a4954e1d4b79e79444d6adccbcf7573
font_01_sfnt_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 7988 bytes
SHA-256: e3761633dcc273ee1624f243f1a3effa0645c455ba2bd57ac9a11fbd32733cae
font_02_sfnt_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 10708 bytes
SHA-256: 96f13f492be5ebfbb0eb79bc41c5b12b77ff13794e3b39ec2644136f725d1eb3
font_03_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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