Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ee468d2b323dbb…

MALICIOUS

PDF

90.0 KB Created: 2021-04-28 21:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a7b9f727f6ca02ed80022218bae3c63c SHA-1: ddc09adce9fcd1e44303e8c74892f874928517c1 SHA-256: b9ee468d2b323dbb5309fc7e9cb6a7c46819d864f72ab3056ab9c312356341f3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded external links, many of which are to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or redirection scheme. One of the primary URLs, 'https://xajibur.ru/strik?utm_term=wow+computer+for+seniors', appears to be the main lure, disguised as information for seniors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=wow+computer+for+seniors PDF link annotation
    • https://mugilofovoki.weebly.com/uploads/1/3/4/6/134616553/8768328.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451742/normal_5fcbfe97ec9f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389355/normal_5ffe0f1a6374e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403674/normal_5ff406d6192b4.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/werazaxx7dja.pdfIn PDF document text
    • https://zogelamugem.weebly.com/uploads/1/3/0/7/130775951/xogexujoxo_bokanebipawova_lorazelosakegeb_wojunomuvaze.pdfIn PDF document text
    • https://depujoseteg.weebly.com/uploads/1/3/5/3/135309287/ddaa02c1384d9.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/dazevunizefoxaniwom.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/4777532.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/dorulusof/sidebugejaxof.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/apply_consolidated_marksheet_madras_university_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/fanowedomefot.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/telugu_bible_software_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/fillable_5e_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/54685252734.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/cerebral_cavernous_venous_malformation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56163c82-b9da-49e8-a171-6c347f6c62c7/army_drill_sergeant_school_fort_jackson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e5f96c2-06ff-492a-9db4-a8bec097fccc/bell_bicycle_computer_manual.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_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 5024 bytes
SHA-256: 311f64ce4d4b7a6651d8ec9a633f508286b76aa72d77294c74c6bff9eee3d2c5
font_01_sfnt_off000133f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F5 11456 bytes
SHA-256: 7d43cdb4ad5489e1091da5a257004b34d40bddeedb2010092cd83d73278d40c7

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