Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a593153c2b96113…

MALICIOUS

PDF

98.2 KB Created: 2021-04-01 11:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2858818ec83d3d54b67d23a9c7439b60 SHA-1: 22dd6ca85b25cbab2fb820573819e3d397199ad8 SHA-256: 3a593153c2b96113b8d5a32a9f901595efbc637124a81e2a3eac9a0c090c8a21
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/award?keyword=dysfunctional+uterine+bleeding+thesis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485809/normal_5fd7de54b2999.pdfIn PDF document text
    • https://giximelet.weebly.com/uploads/1/3/4/2/134234701/a97230eff9c3ab.pdfIn PDF document text
    • https://wukemurorafol.weebly.com/uploads/1/3/4/3/134338373/1095693.pdfIn PDF document text
    • http://jolaxamitagifa.iblogger.org/ace_test_series_2020.pdfIn PDF document text
    • http://sazulido.medianewsonline.com/ferguson_anti_politics_machine_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392210/normal_5fe312e2801e4.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/66356833843.pdfIn PDF document text
    • https://cdn.sqhk.co/kesusevuzep/idYbdgc/transportation_in_vietnam_report.pdfIn PDF document text
    • http://nakijeku.mygamesonline.org/age_discrimination_act_of_1975.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/956c191f7b0.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/eERgj5L/multiple_monitor_desktop_backgrounds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465145/normal_603952a6ed0b0.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/fundamentals_of_cloud_computing.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/gjchbjc/busajamepub.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/jib7ijq/wood_joints_different_types.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanesipub.rf.gd/properties_of_parallel_and_perpendicular_lines_worksheet.pdfIn PDF document text
    • http://kozolamo.rf.gd/applied_physics_2_book_for_diploma.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_26325881ff5a4abdaf685c050dfc19d5.pdf?index=trueIn PDF document text
    • http://jizuwugi.rf.gd/amd_driver_detect_tool.pdfIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_e13ff65ed34a413a94feb3e6162a2712.pdf?index=trueIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/manual_kia_cerato_2020.pdfIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_155f911f8b51423fbb26fdcba83bb0b2.pdf?index=trueIn 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_off00014225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14225 5660 bytes
SHA-256: 5c21d86e64e555e551c244c6bfa72d8ce6d0ebe543fbd01853c794b214ae4d2a
font_01_sfnt_off00015565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15565 10940 bytes
SHA-256: 6736f59b1996a49fb2fa83d61b36d1b1d691a33e10a2db4086a9bc754233db91

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