Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aefeedbbe47a6f4…

MALICIOUS

PDF

76.6 KB Created: 2021-04-02 03:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a67db80501cb0241bd3cf1bf1a8748c7 SHA-1: d9b78e02d6d2abb2d7daa0c9deeade827871956e SHA-256: 7aefeedbbe47a6f4afae11336ef44c877bdd4bb2082e23dd50a7ce27470d0e34
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/123?utm_term=the+crucible+study+guide+questions+pdf PDF link annotation
    • https://cdn.sqhk.co/nivavepe/Dhgbiit/dragonvale_wiki_islands.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/2hcV0DT/bandpass_10_inch_subwoofer_box.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/igOrheb/the_duchess_of_malfi_john_webster.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/Ijjjagj/57414675338.pdfIn PDF document text
    • http://good-production16.site/black_and_decker_air_fry_digital_4_slice_toaster_oven4ike8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_5fd862f8c284a.pdfIn PDF document text
    • https://falevuwutote.weebly.com/uploads/1/3/5/3/135301590/2680481.pdfIn PDF document text
    • http://zagesevava.iblogger.org/19115179175.pdfIn PDF document text
    • https://vowodilob.weebly.com/uploads/1/3/4/6/134697463/8882870.pdfIn PDF document text
    • http://mnclassis.org/fire_and_blood_chapter_1_summarym538i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465709/normal_5fcc5455bd156.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380382/normal_5fcc38ed079a9.pdfIn PDF document text
    • http://rakakap.iblogger.org/pepepenunemikejodibif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413703/normal_605f884d63998.pdfIn PDF document text
    • https://jimiduwukav.weebly.com/uploads/1/3/1/4/131452794/6260600.pdfIn PDF document text
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/2fb596f4b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sagisat.rf.gd/how_many_umbrella_academy_comic_books_are_there.pdfIn PDF document text
    • http://vasugam.rf.gd/10906252698.pdfIn PDF document text
    • http://tifalupu.rf.gd/prevost_featherlite_price.pdfIn PDF document text
    • http://joboberunora.rf.gd/96272978667.pdfIn PDF document text
    • http://degarikudaxam.rf.gd/67278544648.pdfIn PDF document text
    • http://webenawawejoped.rf.gd/tizugidu.pdfIn PDF document text
    • http://vemevusakeke.epizy.com/tadimulebimaviletu.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_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 5524 bytes
SHA-256: 862e6a1707c4699c224415ecfc098c6e2be42072ef409a58709598b83c68d02e
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 11072 bytes
SHA-256: fcdb881300da38815e9a93ee4c00c260be9a23f66080e27937dbfd6315bca79a

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