Malicious PDF — malware analysis report

Static analysis result for SHA-256 55202bbb78e8fd48…

MALICIOUS

PDF

82.0 KB Created: 2021-02-25 22:20:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 72450b31f405eb14569c023a532d2132 SHA-1: 5b07f3c3588cb619538d2e7937dac7908a985897 SHA-256: 55202bbb78e8fd48428c45075a7b5f7dc4d21e572d9c6b7d0a88bfc61a4d2d27
214 Risk Score

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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=self+awareness+activities+high+school In PDF document text
    • http://gejesixave.scienceontheweb.net/beroreg.pdfIn PDF document text
    • https://denudosija.weebly.com/uploads/1/3/4/0/134017010/riguzap.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/venstar_t2900_blank_screen.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/19983814081.pdfIn PDF document text
    • https://cdn.sqhk.co/bemapebe/cxyU7gi/jidamurebigenumoxe.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/gravity_falls_journal_3_blacklight_edition_ebay.pdfIn PDF document text
    • https://kusafowagu.weebly.com/uploads/1/3/1/8/131871480/4c6122d.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/qQhjXge/88074363224.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/atlantic_fleet_free_download_pc.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/jifazapip_gifuzuwusivon_netidug_tomajejugore.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/dudigonifu/codecombat_computer_science_2_level_15_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/karujiruv.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/how_do_you_critically_analyse_a_journal_article.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/tamil_meme_templates_app_for_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/93447119659.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/background_photo_editor_software.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/jejume.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/zepogoximutejapedesazuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/zulusewa.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_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 5400 bytes
SHA-256: 47b01ea22fca0104bdd39faa331f6869f5ae2550b3e7d14a90a5d62ba2e56c5c
font_01_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 10148 bytes
SHA-256: 055e437290255a0c64605c1473590acc184933292031b1464df0bc634fe28f2c

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