Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd2b80ac97b07c4…

MALICIOUS

PDF

76.7 KB Created: 2021-03-15 03:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bc36760d4f1d2825cfacb48b71e496b3 SHA-1: 522faacd600ac83a1108e11e71735a70fe61ab5a SHA-256: 3dd2b80ac97b07c465e15af6eb675f215e606bab6916e381697e772f0fe7172a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a lure related to an astronomy book. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score indicate a malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links 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://pelibifir.ru/award?keyword=a+problem+book+in+astronomy+and+astrophysics+pdf PDF link annotation
    • http://cybety.xyz/toruditodimarokutopitifwwbb.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/Rjbxwie/aprilia_rs_50_2007_manual.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/lepevipivololikezivujufarytg.pdfIn PDF document text
    • http://welogotodamiris.22web.org/what_happens_in_the_last_book_of_a_series_of_unfortunate_events.pdfIn PDF document text
    • http://fimunukowira.iblogger.org/64403599069.pdfIn PDF document text
    • http://bioforcecolumbia.site/82944592301gfkf0.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/Pjiggig/69880921759.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/njhgegf/underhand_serve_tennis_2020.pdfIn PDF document text
    • http://legko.travel/10056907463d6bs5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_00949581d8c94885a1eb1cdadbfbe46d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazovugal/vapuwozutumudab.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_6f3f420e628744f7a24d869759b99800.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f77784b-22db-4d96-b93c-5f18d4a2d82b/what_goes_with_red_wine_sauce.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/rosivikijesutowenaj.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/micromax_phone_ringtone_brand_fusion.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_322fb65e442c431b96ed5306307779d6.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_00447dd6a51b4d4f8b05c0e810238550.pdf?index=trueIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_c58e8ce370de4ee58efe327abeacc605.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0297c2-01bb-4997-8c48-b6dd60be4f46/22783680762.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/window_air_conditioner_parts_and_functions.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_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 5688 bytes
SHA-256: 28b92325512231dcc5bc4a35258aaa28b27b59ce7c1864db27e7aa21d9ef72bb
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 11044 bytes
SHA-256: e2ca19922e9b44b3129fdacfc9377b7e15cabafffc53384501bd51225642e0f9

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