Malicious PDF — malware analysis report

Static analysis result for SHA-256 779997cdf160eeea…

MALICIOUS

PDF

76.3 KB Created: 2021-03-03 05:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 71956ac75777a5c174ccb10449c8d79a SHA-1: 93e07b8e483bba239458297c3f76be73dca35ccb SHA-256: 779997cdf160eeeaba781d76d5bff1cf3bd973ae64d097088b19e6a530ddbc00
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 0.9997

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 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://lozipotod.ru/123?utm_term=how+to+put+up+a+g5rv+antenna PDF link annotation
    • http://fekevopimibun.sportsontheweb.net/48256467387.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/jeWOJyf/kerab.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/wagiborokotibofatax.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/vonimutelil.pdfIn PDF document text
    • http://fomamiforepu.22web.org/beetle_care_sheet_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/Gjf3Dia/beat_the_boss_3_cheat_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_600f77b1c8c8a.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/the_boy_in_the_striped_pajamas_school_project.pdfIn PDF document text
    • http://pelinebaj.mypressonline.com/what_is_organizational_structure_in_project_management.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/GgdhbpO/super_mario_run_full_game_free_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490735/normal_6004be4a45c92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389585/normal_60066afb5e6c9.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/QPhcNz9/oasis_diner_restaurant_brooklyn_ny_menu.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
    • http://matasup.rf.gd/10540948671.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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 4848 bytes
SHA-256: 2c30d023d7e90d7f317c5eceac1456c78b9fafa8e17ca568eb651740e2d441a5
font_01_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 10768 bytes
SHA-256: 43ffcf936c6823db98c258e736f46f35f775573145e8056a3e8a835d83db46f9
font_02_sfnt_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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