Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ef350197b8af7a…

MALICIOUS

PDF

81.2 KB Created: 2021-06-04 00:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 594326819375faf674b7b00d4b9bbb35 SHA-1: ed8191ca4202a79aa11353b29364b94928e70616 SHA-256: 41ef350197b8af7af73af94fe359355e3d9678ef382c24b91c5c708601b74173
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

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=delirium+imdb+parents+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476152/normal_6016df1fbaf0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_60141ed28ef6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485591/normal_5fdea60601f39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_600dda2031571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_60278273154dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408853/normal_603c55a04b42b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_6053ec10cfc13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417208/normal_6007b0252f95d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_60b944b55e6c2.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369764/normal_60b24e98bee46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf936e0-cf0f-4bf1-83cf-88d84d73b931/kegemulivusa.pdfIn PDF document text
    • http://gibabug.pbworks.com/w/file/fetch/144565146/13936589163.pdfIn PDF document text
    • http://demopefo.pbworks.com/f/breezin_thru_theory_answers_chapter_11.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/32244265889.pdfIn PDF document text
    • http://nidibewuzi.pbworks.com/f/basic_statistics_for_data_science.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/79703813303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8106d3-7b1b-4d7e-b31b-53583e31ca15/percy_jackson_and_the_olympians_series_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/138e0924-1dff-4ef1-8230-89990d00b759/45271323307.pdfIn PDF document text
    • http://fogofalo.pbworks.com/f/samsung_smart_tv_opera_browser_install.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/f/minecraft_dungeons_mobile_3.0_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88d6bb4-9d43-480e-ab05-16f3db26be50/can_you_day_trade_penny_stocks_on_td_ameritrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8a9368-cb1c-418b-bb02-3b2e152e7239/maggianos_reheat_moms_lasagna.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_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 5416 bytes
SHA-256: 31ed69b0a4d3c54c791d5f4a1a8c40f67acec6ee1e4b55aa7b845ffd42bb8714
font_01_sfnt_off00010f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7D 12156 bytes
SHA-256: 0c26e39dbe252c9dc5746ec650c77f9e5043fd88334ca05159dc91f7a5ec09f3

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