Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9ccd7a628d6dca…

MALICIOUS

PDF

73.6 KB Created: 2021-03-20 08:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a0b9a1463d44cd53ba4061436d154f96 SHA-1: 734e9c82451f20f61f1988b86cc8b564f8932bbb SHA-256: bb9ccd7a628d6dca64f8f469c018a072b12ace8ecf4654a4cf3a328a1e582e84
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 0.9997

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://bologen.ru/award?keyword=telugu+christian+books+pdf+free+download PDF link annotation
    • http://wuxixezigitezir.mygamesonline.org/dizekirujinaxepoxemusuxo.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/zikudofiloxejixumekodirej.pdfIn PDF document text
    • http://reassurez-moi-fr.info/is_hamilton_beach_a_good_toaster_ovenqoby6.pdfIn PDF document text
    • http://chistohome.moscow/89338669346q8ujy.pdfIn PDF document text
    • http://wersita.fun/tezufogukufimogowuteduf6lxv4.pdfIn PDF document text
    • http://bowuvudofi.scienceontheweb.net/18661329963.pdfIn PDF document text
    • http://blekrossi.ru/samsung_dishwasher_dw80k5050us_installation_guidekugzv.pdfIn PDF document text
    • http://copyrightsupporteds.com/affidavit_template_queensland_magistrates_courtxag80.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/83277590845.pdfIn PDF document text
    • http://limons.space/nogilaknfol.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/nujojibl3scs.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/in_adams_fall_we_sinned_all_abcs4qjh8.pdfIn PDF document text
    • http://abwaab.su/math_kangaroo_canada_2016_answersiebis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/android_studio_sdk_manager_license.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/srt8_challenger_2008_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc0ed46-4ea6-40c2-91fb-bfc665c0c2b5/harman_advance_pellet_stove_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03ab3cb-8510-4229-b16a-c269a005a862/20459020126.pdfIn PDF document text
    • http://durenifujogax.myartsonline.com/dukipezajopamol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c0fc13c-2441-4a9c-8dd0-15c25bb5fd87/kelibazijuvusajeguf.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/86403386298.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/zarijewinumisudo.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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 5660 bytes
SHA-256: fc3a77ed65985940da5c0a24a2f14deb71a7d80c812165ae35fe2f61a4b69eb2
font_01_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 9972 bytes
SHA-256: b9eb65efaee9e810581b5320235a676a37bfb9eece21b788746b530c74f7ae12

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