Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85a6ba6f21324df…

MALICIOUS

PDF

85.4 KB Created: 2021-03-18 16:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3241c714846ee0cbc0629b47bc4ee64b SHA-1: 5da8f9affe5986678ef9aa33b67ba065fda75277 SHA-256: e85a6ba6f21324dfd4e8203c242bfea3bdcb5df9c4326e9c99ecc0d12bfbf877
126 Risk Score

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-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://dafemum.ru/award?keyword=isolation+and+identification+of+actinomycetes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461767/normal_60282be00c2d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_60433827d901e.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/jukalulupuk.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/1297fffff.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/83102455291.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/tejafurajuke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443576/normal_5ffeba9cc01b5.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/liferixobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_6033a8cea0cf9.pdfIn PDF document text
    • http://duwosolutanuz.mypressonline.com/how_to_reset_epson_xp-820_printer.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/jack_and_the_beanstalk_story_book_with_pictures.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_603e18f15052a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/hr_project_report_on_employees_absenteeism.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/zanenudavabewov.pdfIn PDF document text
    • http://lukigek.rf.gd/47450140117.pdfIn PDF document text
    • http://bunizavax.rf.gd/high_school_students_should_not_have_to_wear_school_uniforms.pdfIn PDF document text
    • http://nozosikela.rf.gd/lebodijid.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/how_to_get_fit_without_dieting.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_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 5244 bytes
SHA-256: f69c32c1f6bfe63d4b20f59b5fbe3bd72b5fa79e06cf4c983123d76045dec827
font_01_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 10896 bytes
SHA-256: 2e83afce6ec689a3eed7e2faedfe95a8e4038f3cf80baf383ddd8434598a4918