Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b9082d5f17f830…

MALICIOUS

PDF

75.5 KB Created: 2021-04-07 17:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 550e44885b97a53aa43556714cfee6e1 SHA-1: 70acf15da1c5ae297ceb5284a9ce6b318b6efe4d SHA-256: 35b9082d5f17f830a32ae55f5e27f74c4d4266b80ff23021a9d794d3efd6ea08
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 0.9996

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://xajibur.ru/strik?utm_term=war+of+the+worlds+2+the+challenge+reunion PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371508/normal_5ff50cf758dcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443819/normal_5feeca243eb9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5fe637689a9f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_60321257a7a4d.pdfIn PDF document text
    • http://uptodate.site/the_shakespeare_stealer_chapter_15_summary11la4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_60110e5db63e1.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/amazing_grace_organ_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_605520d39ae44.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/34850796112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_605efe0f57d64.pdfIn PDF document text
    • http://itali-big.space/siete_habitos_de_la_gente_altamente_efectiva_stephen_coveylpggp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_5fe8ee7d563b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_6015b85dbd7e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387810/normal_5fec52263ff3f.pdfIn PDF document text
    • http://bejawutipage.mywebcommunity.org/design_of_pressure_vessel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_5fe5ec74a48f1.pdfIn PDF document text
    • http://help-violation.com/xapupekikimo7jg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_604872cc12de6.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/7678ff1b-3527-4ed7-a27b-446130292c39/fishing_lures_for_trout_amazon.pdfIn PDF document text
    • http://timagugovoxo.onlinewebshop.net/wordly_wise_book_8_lesson_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d70db6-6c7c-4bd6-9374-3a859f5b2683/94906805133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d506ab-954d-44d2-ae3a-4692aec79876/3803531977.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_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 5520 bytes
SHA-256: 444e669fa8e98516cfd79154df37b74d5ef59ad516befac7182fe52f6de2d179
font_01_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 11280 bytes
SHA-256: 940860bad1b2c27c65f2980a16c6d1dc505c302895bf14c3957447cf4a24eaa1

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