Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f911329c165463…

MALICIOUS

PDF

81.5 KB Created: 2021-04-04 12:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 994a03e7837124ce7fc720f73e1950ec SHA-1: 3b23b855baa70e1f3e6fbdbc8ee89d6f288b49d0 SHA-256: e4f911329c165463cc4fa8888f1f3357c2516000bc0a31cddf35f71fcd8434d5
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 0.9997

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://golowaki.ru/wix?keyword=the+red+fox+clan+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464301/normal_6058ac5fee5b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fe55b4355f63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_605c64289bc79.pdfIn PDF document text
    • http://masozoza.iblogger.org/7190969643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6060300655eb7.pdfIn PDF document text
    • http://pevetune.66ghz.com/asmaul_husna_artinya_dan_khasiatnya.pdfIn PDF document text
    • http://zivolizukaliwa.iblogger.org/ascii_hex_codes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378381/normal_5ff63066776e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wedovomukebupa.epizy.com/examples_of_conflict_resolution_methods_within_an_hr_context.pdfIn PDF document text
    • http://ligirewela.epizy.com/tubunuzud.pdfIn PDF document text
    • http://joxaralabodegad.rf.gd/batman_arkham_knight_xbox_one_achievement_guide.pdfIn PDF document text
    • http://nufosegi.epizy.com/what_does_a_tree_trunk_symbolize.pdfIn PDF document text
    • http://sazapexaxes.rf.gd/18106876316.pdfIn PDF document text
    • http://jisavimi.rf.gd/life_after_apk_1._0_123.pdfIn PDF document text
    • http://poresiz.epizy.com/xiniwajufosi.pdfIn PDF document text
    • http://zasegusof.epizy.com/baofeng_uv-5ra_vs_uv-5r_plus.pdfIn PDF document text
    • http://temitiz.epizy.com/13687773527.pdfIn PDF document text
    • http://vulebodifoguvar.epizy.com/dell_vostro_3568_spec_sheet.pdfIn PDF document text
    • http://gokotid.rf.gd/autoestima_y_autoconcepto_en_la_adolescencia.pdfIn PDF document text
    • http://jaterivi.epizy.com/pibazugulovifekejenefoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 4740 bytes
SHA-256: 4551ae3a2af74dfea75edad86e023febcbb2e33612ea4d4f540a4c3ad0e0e166
font_01_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 10528 bytes
SHA-256: d9af8783d2cf838ff70469a74923c5f1fae8cb8ccc5a41780a6a1ee58ca77f43
font_02_sfnt_off0001295d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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