Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fc21b0de84d3b2…

MALICIOUS

PDF

86.8 KB Created: 2021-04-12 20:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 064df157f88bea961dbdb731992dffee SHA-1: 139e25346d582beef32bc8f0417e839e73da7b4e SHA-256: f8fc21b0de84d3b2e288f62b63f228ae16c894202b2a1467d0aa206c5df93ea5
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://mezovuduw.ru/strik?utm_term=why+do+birds+call+to+each+other PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457570/normal_603ea37ca03c2.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://astropsychology.website/woborigowifonapixuzawaloxl767.pdfIn PDF document text
    • http://reduslimitaly-official.site/losefiwim3nqr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424672/normal_5feb1646565bd.pdfIn PDF document text
    • http://natural-shop.info/audacity_software_for_pc_freewh4jt.pdfIn PDF document text
    • http://zuvomitapafi.22web.org/virology_textbooks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_5fd2659a64c13.pdfIn PDF document text
    • http://badgesverified.com/zejibililibogaxgjg7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_60215344ee38f.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/04ece494-d98e-436b-ae4e-99c297c9d985/how_to_make_honeywell_barcode_scanner_auto_enter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f1b82e-f707-46e8-b2f9-46b5a77ee7cc/44604158890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc05f49-324d-4e5c-9f77-5c37917a6fd9/shatter_me_complete_series_in_order.pdfIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_fefd6e873ae240abb24ed7bd8a557e83.pdf?index=trueIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_78fc3fe9c13c4b2eb2d01da30d6e0c16.pdf?index=trueIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_d56f109f4d704c15b5c8653939f17446.pdf?index=trueIn PDF document text
    • http://xobiluwova.epizy.com/calculus_11th_edition_ron_larson_bruce_edwards.pdfIn PDF document text
    • https://bed2724e-b6a4-42c6-a365-5b2dc6a82e2f.filesusr.com/ugd/9f087b_8f1224ca9ec94a3d93746a3259034a76.pdf?index=trueIn PDF document text
    • http://lokutoge.rf.gd/64026202872.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_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 5280 bytes
SHA-256: c4cfb9b18e57e49a89bd3ef8132b94b77ce1bf1e6331a260fe28ad388b9b38e0
font_01_sfnt_off00012785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 11312 bytes
SHA-256: ec79b46bf411d75f9e941ad822e48cf8a0abd1fb6152f2437df8cdc784f24c71

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