Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b640d851d03f0a…

MALICIOUS

PDF

84.0 KB Created: 2021-03-26 01:07:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cca4eed131bf115623889d19b961e921 SHA-1: b90c0efb8b94a29634d940683813c2cfa76d966d SHA-256: f4b640d851d03f0a59f2bd1d5d995bfd4da35498c4b83e1c4cead4a18e94012f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=first+alert+carbon+monoxide+detector+3+beeps PDF link annotation
    • http://rumigiwataj.getenjoyment.net/blossoms_of_the_savannah_questions.pdfIn PDF document text
    • http://ighelpcenter.xyz/coordinate_geometry_class_10_ncert3l0k1.pdfIn PDF document text
    • http://arthromedro.xyz/defiant_outdoor_light_sensing_timer_instructions7uzhp.pdfIn PDF document text
    • http://vegunax.getenjoyment.net/cancer_de_pulmon_oncologia.pdfIn PDF document text
    • http://prodson.fun/how_to_pass_the_driving_testbdtcv.pdfIn PDF document text
    • http://xeeewq.xyz/how_to_learn_indian_cooking_at_homezi5yj.pdfIn PDF document text
    • http://numulul.mygamesonline.org/35070067304.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/ganubatebedoxez/79581092341.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_be522afee4d64fb393eb55fcf206465c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/batch_manufacturing_record_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/kuxakubaxosikikagoxesat.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/maluwufumuxapesedusogud.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/aws_cli_cloudformation_example.pdfIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_a02488be31cc4d4b9a9dd4eafd72926e.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_ebd5677bc6f84d6b866eb809777bea74.pdf?index=trueIn PDF document text
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_af320345b35543e2a85d876d6656abd3.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_68c961a0a42e4870af3494b5d3a7340e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tumasun/dell_optiplex_9010_specs_i3.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_fd31d620013447cdbee0129ec3c14b16.pdf?index=trueIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_b45521432bef4f169e6e9a99433a95ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/assam_rifles_bharti_2019_online_form_date.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_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 5332 bytes
SHA-256: 9636c96a2a17c2cb8cc27100c8daf58e6771cc6cdb91738b6644b7c91daf88ed
font_01_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 11092 bytes
SHA-256: 2cc4ec0dbb2005b6d51d6ddd82ffb9de02b85c36ee03eb18c3d303be9df5e674
font_02_sfnt_off000133d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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