Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5902c3cf6984dd8…

MALICIOUS

PDF

74.0 KB Created: 2021-04-01 02:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a0b2b72bb2713f8040a9ac1bf5b2f654 SHA-1: 464e50d67ea550f5f03cce282dd6184ad581dc86 SHA-256: f5902c3cf6984dd842c95d6c09b88539ffc1ffe11f0806351cbfc7606fbebd70
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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.
  • 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/award?keyword=active+and+passive+voice+overview+chart+pdf PDF link annotation
    • http://paxosij.mygamesonline.org/77196917656.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/mathematics_books_for_class_12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427828/normal_603a15cb148f2.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/pavaberukoxafapusoxatelu.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/nixebiwajakag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_604109fb94a65.pdfIn PDF document text
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/nujorivor.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/xalijapokez.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/jofepajozawegolomera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_2f75b831ac2e4be8851548727fe995e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/restaurant_bill_receipt_template.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_7c1a6af56efe487094d4387f1221a33e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/titanium_engineering_materials_and_processes.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/kofidezivefaketozuvu.pdfIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_0d4d7b8965dd408e91c6ef282fe9f572.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_89fcb71cf3ca41d8bb5e120c7aebb82c.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_5bced5d9f8774f18857efc65156eea59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/gigejewogusafigodipa.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/fancy_text_keyboard_apk.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_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 5352 bytes
SHA-256: 0f11cf75bc5cd572a5b7646dcca4171bf70ce6cf7247961aa839d6d48a463ea6
font_01_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 10344 bytes
SHA-256: 4a1dca7afbe36c075f85523990b97a6aad515f49784d886ceb7faef0d4271da3

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