Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eeb6cd260e29b78…

MALICIOUS

PDF

67.5 KB Created: 2021-03-27 20:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 46babec89acbaedd4497b4031dd83a65 SHA-1: 734e28ece3e0791764cf42df086b0ed95c0f7876 SHA-256: 4eeb6cd260e29b782ab3966b5a3a460894bd3b1a39704df34e57e59e4db33bc6
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-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://maypoin.ru/123?utm_term=coloring+sheets+for+easter PDF link annotation
    • http://kozijadeji.22web.org/31913893061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452171/normal_603c3d599461b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486192/normal_6005df16397ef.pdfIn PDF document text
    • http://videohost.space/77687210434ypzzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448110/normal_5fcb36d17195d.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/jijdm8h/house_designer_fix_and_flip_hack_mediaf_re.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_603f7a25d7072.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/bjbjbhb/66082838279.pdfIn PDF document text
    • http://nncucuucuc.space/verdi_anvil_chorush3urz.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/54431360940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476294/normal_5fcd7e3b55e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_601b21e8e61d9.pdfIn PDF document text
    • https://cdn.sqhk.co/wuseguwe/Fhajbib/piwomumon.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/727832493.pdfIn PDF document text
    • http://shoop-fe.ru/85775796683hxnv8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tupibamogowoful.rf.gd/85118540438.pdfIn PDF document text
    • http://viniwowosur.onlinewebshop.net/espresso_english_free_english_grammar_book_level_2.pdfIn PDF document text
    • http://fukokikedusej.epizy.com/41466591946.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_off0000cd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD20 4936 bytes
SHA-256: 80e59b73c49602d2b52cd06010652def997f08ea8f9586abb911d331cffb0d6d
font_01_sfnt_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 10384 bytes
SHA-256: 828e3df55749972c4d56bb5e92a0297be922bcb27680bc541f7e422918f67c6b

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