Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ad00b96295e386…

MALICIOUS

PDF

82.1 KB Created: 2021-03-30 14:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: be3fbf20e0801329f2b26776f1440067 SHA-1: 88da84269f738aa0589d21e1d690ce6280430f2e SHA-256: 40ad00b96295e386d880ddfdb82dd2db2a585452e77ce3e4e9f8da0ae2178812
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata related to PDF generation, but no direct user-facing text that would indicate a specific lure.

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://lozipotod.ru/wix?keyword=points+of+sail+explained PDF link annotation
    • https://cdn.sqhk.co/fetumamuv/chfijgi/cartoon_background_for_desktop.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/vuniwopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_5fd17c8788da2.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/fngeLjj/pipagigetoxixogu.pdfIn PDF document text
    • https://cdn.sqhk.co/dufukeraj/xxyzgeG/double_discounts_worksheet_chapter_7.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/tH0SidV/75973736741.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/pibituzefebuxadedu.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvivazonewa/ZjecnVx/28840813084.pdfIn PDF document text
    • http://sutezesibopixiv.medianewsonline.com/bumasekikulotaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_603b5c1aa62e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_600b9e7766911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_60294b56e06f6.pdfIn PDF document text
    • http://mukuwasoveta.sportsontheweb.net/subafexafawexuvev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fd637b558559.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
    • https://s3.amazonaws.com/xupizewuxere/kofazadepanuritamedu.pdfIn PDF document text
    • http://mogixos.atwebpages.com/scouts_badges_and_awards_book.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/48370536837.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/fractions_decimals_and_percentages_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/android_max_number_of_binder_threads.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_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 4796 bytes
SHA-256: 59bbb37244f2b10c07519c6bb5e6049a34001bed3f71aeabf429fda8e81085e3
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 11380 bytes
SHA-256: 9e7cd78eff0da5b66815d31a3c996857c70819c384c80ba8ad63fc8ba13155c4
font_02_sfnt_off00012d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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