Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6410e71905e3a24…

MALICIOUS

PDF

84.8 KB Created: 2021-03-25 14:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 480f60eba9764c79190f983635583216 SHA-1: 53aa86a47e7fcb44000c12db34acac5bb570660d SHA-256: d6410e71905e3a24c723486baadc8990504806964d720ae5105c4b1aead6f5db
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-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://bologen.ru/award?keyword=financial+accounting+theory+notes+pdf PDF link annotation
    • http://nncucuucuc.space/65009692974lqz28.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/burger_king_breakfast_menu_near_mell46u.pdfIn PDF document text
    • http://creditreportus.info/59017620915szrih.pdfIn PDF document text
    • http://smartroom.pro/disizemupudaxorerafomadunl3gl7.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/78820114808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_6015190c4f919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_603633345812a.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/macroeconomics_olivier_blanchard.pdfIn PDF document text
    • http://fevuworejefe.iblogger.org/wodugivelozokukesiv.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://larazegabolulaf.epizy.com/jusilomanuzexare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c11e73-5464-4b1f-9ed0-ea4e64ecf1ca/bosch_800_series_compact_washer_and_dryer_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb077df-7faf-4af4-be12-cecd25222906/personality_plus_test.pdfIn PDF document text
    • http://muwodedera.epizy.com/bocio_multinodular_tratamiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c864088-2fc3-47f8-a1b0-8ac260a7b5e9/what_do_you_understand_by_sustainable_economic_development_class_10.pdfIn PDF document text
    • http://xamipekuxedatif.rf.gd/duripajovogisale.pdfIn PDF document text
    • http://weguxaja.rf.gd/57925287669.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 1872 bytes
SHA-256: 223568fc15723d408f00056d2cf6bf73ec0b5e81a44ab038b8d55cfaeb1c3c3d
font_02_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 5472 bytes
SHA-256: 3e9282b95cefc79fd631cb8f613aaf821f60d058f954f1a8754aaaaf30dcc61b
font_03_sfnt_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 11452 bytes
SHA-256: c627f5043683d9b10b01cf620cb3239367d9051ff2e0812e63dc9849397652af

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