Malicious PDF — malware analysis report

Static analysis result for SHA-256 de31b7825fe392f4…

MALICIOUS

PDF

96.7 KB Created: 2021-02-20 13:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2e1ff27f8afc27154813cdf2bed779a4 SHA-1: 65a58d91ec921ba68486a8ff88bc41ffc2a937ac SHA-256: de31b7825fe392f4e69dcd042f7b5c9aca935fc1b31a0493f1f4bae2020608ec
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://baarspo.ru/wix?keyword=runescape+old+school+pure+guide PDF link annotation
    • https://cdn.sqhk.co/zimopaji/pBgeibJ/jigawuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6009d2a5cd7d8.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/fgfyfhb/war_card_game_play_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448094/normal_6007d92baaa6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494661/normal_5fc884a68c439.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/jg7ridc/hangout_word_meaning_in_urdu.pdfIn PDF document text
    • http://reassurez-moi-fr.info/27887255445t1soa.pdfIn PDF document text
    • http://lishop.site/gusion_venom_wallpaper_hdqwd6v.pdfIn PDF document text
    • http://meetplafond.xyz/honeywell_1981i_barcode_scanner_programming_sheetok0d9.pdfIn PDF document text
    • https://nuvawusop.weebly.com/uploads/1/3/5/3/135302159/zunarumim.pdfIn PDF document text
    • http://lastasked.com/gexemozakow5m1wo.pdfIn PDF document text
    • http://deflecfcvy.best/birdy_grey_dresses_dusty_blue0gwce.pdfIn PDF document text
    • http://liketime.online/el_video_de_la_nia_de_facebook_compo137q.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/bjahbt1/86086966226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/m_s_to_km_h_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/64737812831.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_off00013fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEA 5340 bytes
SHA-256: 484f7cf646dc1f3c166ba5d41d9a4345756d667f308723ae76b74915a7d48e8a
font_01_sfnt_off00015212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15212 10308 bytes
SHA-256: 4f9633932bebd7475426895c8af3609dd73ca1831cebf7e1dbf667b50cd0a8cf

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