Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0cb90fea06b41f…

MALICIOUS

PDF

74.4 KB Created: 2021-03-05 05:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cb6f40df61a03b02ddfdb9bb1248edcf SHA-1: b20dae13fcbdaa20e825b492c4d8411294dfdcaf SHA-256: 4c0cb90fea06b41f11095c5c5287d228ea5209ba970e54d76127843d53c486fe
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, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/123?utm_term=frigidaire+combo+washer+dryer+troubleshooting PDF link annotation
    • http://nebo-baikala.ru/20661195667h78wr.pdfIn PDF document text
    • http://it50disconto.pro/relative_clause_worksheet_grade_5fwn57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408324/normal_6007e5ed0a917.pdfIn PDF document text
    • https://xaburopufazig.weebly.com/uploads/1/3/6/0/136051881/856427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456676/normal_5fe14641ce648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_60419e05126eb.pdfIn PDF document text
    • http://doweryklkq.space/google_drive_folder_fasterke1om.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371248/normal_5fcc547bdb11a.pdfIn PDF document text
    • http://4kuhd.me/what_is_the_highest_position_in_the_us_militarycjtwd.pdfIn PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/mimejiw.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/pesetufavo/67108960320.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_092255076804446a94218d3db49537eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/ordinal_numbers_for_kindergarten_worksheets.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_c38cf1c87e3f421fb325ff4507a7310a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/49722758787.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/parulupaxupureg.pdfIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_08487c8bbee6462b8c1a7a5a3facab5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/wisdom_for_mothers_book.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/braeburn_thermostat_manual_2990-_01.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/golden_sun_lost_age_djinn_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/communicate_with_cambridge_class_3_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/98756640042.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/engineering_graphics_questions_and_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 5644 bytes
SHA-256: 59c86c6c627c3290e45290224123a9208a0f5e9cbf7ff0e6e9257a3e2bd29ea1
font_01_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 10272 bytes
SHA-256: 008a2798c03388cea68b969815a851cd8bf4fb70d35bfbdcac46aaf8767d7569

Open this report in the interactive analyzer, or submit your own file for analysis.