Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f614ff1c581c84…

MALICIOUS

PDF

74.4 KB Created: 2021-04-07 21:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4a84be47bcd93f9b87d56f9e2d059fea SHA-1: 54b19f279c58f319e4d564090a9cee71ba4de7d2 SHA-256: a7f614ff1c581c8442ccf77d6d5e09aeeaf4e420670445685c86f32e3bca8c22
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 0.9999

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://kuzutuzo.ru/123?utm_term=bsc+2nd+year+physics+notes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449014/normal_601b1b3a71484.pdfIn PDF document text
    • http://itawegan.space/jumukidajilakerunufulj10g2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5ffd09c148227.pdfIn PDF document text
    • http://gavolav.mywebcommunity.org/34946913900.pdfIn PDF document text
    • http://nulatapukedu.scienceontheweb.net/convertir_de_a_word_con_texto_ocr.pdfIn PDF document text
    • http://magazinrf.xyz/14759785753qysbz.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/17175756095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_6025b6fe57f1c.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/zkijjaC/top_offline_hd_graphics_android_games.pdfIn PDF document text
    • http://kostlike.site/road_riot_mod_apk_unlimited_money_and_gems00y8u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_60228bf257e61.pdfIn PDF document text
    • https://cdn.sqhk.co/lunilageruvu/lhjgBgf/73958109792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_6025a6bc347a8.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/1fc17b1b-df93-44e4-9ac7-1151900fb6a3/is_there_a_demand_for_technical_writers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b0ee13-4a97-4d5f-b500-c6b2d618eaee/one_punch_man_garou_figure.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/berserk_manga_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/562477c3-9168-42ee-95b9-0db33a93f1d6/richboytroy_net_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e916bba-d58a-4a45-8e90-5ac5516ad848/how_to_draw_closed_eyes_male_step_by_step.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_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 5496 bytes
SHA-256: 7a6dca0ec2e5570bd981441e5ba7f4609dff3ca2025096883c174dfbb475544c
font_01_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 11112 bytes
SHA-256: 54521cfc162dd1e052765b76949195355dfdb64005341ccc9da850df58f4ac43

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