Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb31674b566c5b6f…

MALICIOUS

PDF

73.7 KB Created: 2021-02-25 04:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 90b3683a75ea66ebc685a9e8d73fe5df SHA-1: 15c06f70c99cb297dc5f59f6175ac0682156d407 SHA-256: fb31674b566c5b6f7c241de606d4f346cddd9def62ddabd2fd00390b17e75cbe
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 0.9998

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://jottigo.ru/123?utm_term=professional+development+plan+template+for+nurses PDF link annotation
    • http://it50life.pro/cool_puzzle_games_for_android_free7ulwl.pdfIn PDF document text
    • http://zipaxuko.iblogger.org/manual_g_shock_ga_1000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482020/normal_5fde4464b3ad5.pdfIn PDF document text
    • http://amin-ukraine.net/31513979464o3i59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386092/normal_5fdcb9c8d2039.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/modo_de_produccin_de_la_comunidad_primitiva.pdfIn PDF document text
    • http://clobuss.ru/sago_mini_pet_cafe_free_downloada2yg4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375351/normal_5fe3f66965893.pdfIn PDF document text
    • http://girlita.space/61959795614q1vp1.pdfIn PDF document text
    • http://gallery-shop.site/nepanoxuruepuz4.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/5947194280.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litorow.myartsonline.com/simple_russian_grammar.pdfIn PDF document text
    • http://zevusup.atwebpages.com/67999210062.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/3683410849.pdfIn PDF document text
    • http://livirava.atwebpages.com/the_book_of_the_courtier_significance.pdfIn PDF document text
    • http://tufobiwileke.rf.gd/questions_not_answerable_by_yes_or_no.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_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 5248 bytes
SHA-256: 38ced7d3e2278896f33b588e563cbdf3b0c9f84dd8da6459772f570b08b706c2
font_01_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 10288 bytes
SHA-256: 8e1624c17eebd46fdeede4c1e25c41623843e168c721b5f07f5a6d618cd24a7e

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