Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f8ad603af99394…

MALICIOUS

PDF

76.4 KB Created: 2021-02-23 04:33:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d6f459737ad736f311e9373f99de58c3 SHA-1: 8febb5802f56c9735c4c026e2abd400e14cc9f5a SHA-256: b0f8ad603af99394dbd9e9bfa1f4d879dcafda568f1565b80015349d14978529
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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://bologen.ru/123?utm_term=harvard+business+campus+map PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401697/normal_600d0c7b089c8.pdfIn PDF document text
    • https://murunabijijot.weebly.com/uploads/1/3/5/4/135401069/lowixe.pdfIn PDF document text
    • http://nakrutkavk.site/musical_instruments_service_center_near_mec6a8b.pdfIn PDF document text
    • https://govuvafokixer.weebly.com/uploads/1/3/1/6/131607022/setedudegafi.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/tufegekap-wekekozalo-moturaris.pdfIn PDF document text
    • http://maska-respirator.shop/16067332130sp9oq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458616/normal_60142d6e74047.pdfIn PDF document text
    • https://zapotaputilaka.weebly.com/uploads/1/3/2/6/132683001/b91734cff7c1664.pdfIn PDF document text
    • http://mebelintera.ru/pojebuzidetojipedo62cut.pdfIn PDF document text
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/rawiw-segufer-xiworexemerof.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/45a56cbf.pdfIn PDF document text
    • http://ufenmac.com/93146527961vjlyx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_6026e3e3ee158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5fef898491fba.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/bulozor/blank_personal_budget_worksheet_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/4441803766.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/delonghi_coffee_machine_for_sale_gumtree.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/year_2_maths_column_addition_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/best_free_leg_workout_apps_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/cue_sheet_creator.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_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 5348 bytes
SHA-256: 4d241501ff9304ee8574d4a13aaf5ea5239757a9e2c3e9309680d550eb9cea6f
font_01_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 10712 bytes
SHA-256: 8b4956216297a84660f3043357f9447ddd7f26743f0271f7ea88e6efdc03e723

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