Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ed2156fe68bf76…

MALICIOUS

PDF

84.9 KB Created: 2021-03-04 09:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6049a030008578da01e943eaf105d721 SHA-1: a786b64655b9b54343cf675f9e3736df7c4f1f73 SHA-256: 81ed2156fe68bf768d67a058dd761f54f735102660449fc7f9070a9942fd5c54
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary URL likely serving as a lure or entry point. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malicious content hosting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=how+do+you+catch+the+big+fish+in+link%2527s+awakening PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467285/normal_5fdbe796bc5f6.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/jdxhghe/retirement_savings_goals_by_age_40.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/MNujjig/47049049436.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/4115884.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/8477462.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466398/normal_60058e466091d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_603e6340a65e4.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/917959.pdfIn PDF document text
    • https://cdn.sqhk.co/vavefamixivi/Vjhfdxd/cims_cancer_hospital_ahmedabad_contact_number.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/VShb6U8/how_to_use_hand_drill_kit_dayz.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/votulejijoxarovar.pdfIn PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/6224662a.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/mejawiwomak/after-_action_report_aar_fema.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/inventory_sheet_define.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/74784659312.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/ocean_eyes_billie_eilish_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/pitukekix.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/informacion_sobre_el_arbol_alcornoque.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/asus_aspire_e15_drivers.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_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 5580 bytes
SHA-256: d1b94c7d12968af4171e26014030adb2adec13552e637ea7b8780a2d34cdaa9e
font_01_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 10412 bytes
SHA-256: 8912b8726d6183bbd15e64874c9846f17aca8091a0916ae802ac369bbea5ab50

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