Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0160023d5630c2…

MALICIOUS

PDF

91.5 KB Created: 2021-03-25 11:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: be014b8dfb1691d8aeb5daa7ca3d49e5 SHA-1: 595c9f11f0b982ed4051cf837223a55b53622d82 SHA-256: bf0160023d5630c29c106dd661e4ca4c8c0de03034d907448bb2e5c1a00ac4c4
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 0.9955

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://dafemum.ru/123?utm_term=metric+conversion+problems+with+answers+pdf PDF link annotation
    • http://lnstagramcopyrightmanagement.com/les_miserables_25th_anniversary_ost_downloadr2vvd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447087/normal_605953257c4c6.pdfIn PDF document text
    • https://cdn.sqhk.co/fotusonetagu/ji2iceN/beiimaan_love_all_song_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/skhjjhG/sipevuju.pdfIn PDF document text
    • http://raisinsapp.pro/bedurudufoxekagosbi4wi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_602a53da55f70.pdfIn PDF document text
    • http://excschool.ru/bd_full_mapdqwo0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_6011d70e0bc93.pdfIn PDF document text
    • http://jesofafisozosa.iblogger.org/nerivoxe.pdfIn PDF document text
    • http://erogancolumbia.site/bofidojuben3a38.pdfIn PDF document text
    • http://pokupka.space/sevudurutawojuzag9996f.pdfIn PDF document text
    • http://jakartapro.xyz/maths_textbook_class_7_gsebxuf4w.pdfIn PDF document text
    • http://parralax.net/waxekobinesuwenaf0bmm.pdfIn PDF document text
    • http://ingmijn.com/652274951561dj21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_6059aa690251c.pdfIn PDF document text
    • https://cdn.sqhk.co/gabironero/oQiiheu/jomijawo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_600247b4c00ad.pdfIn PDF document text
    • http://securityverifiedservices.com/how_to_put_my_delta_crib_together67cma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_603cb486f3e45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_604ece44373bb.pdfIn PDF document text
    • http://nujilotadotila.iblogger.org/ravuxemowomuvasosokobin.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/tG2icBM/48348591725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_6034233017c20.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://buweweja.epizy.com/9504937996.pdfIn PDF document text
    • http://topipagefesilag.rf.gd/kilatedelilowomoxiwemiba.pdfIn PDF document text
    • http://fakuzilezozo.epizy.com/importance_of_authentic_assessment.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_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 5480 bytes
SHA-256: 0e297e206e41efc17908fb99beeba8b11f87823811d3f7f10cbfcc8740f24219
font_01_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 10948 bytes
SHA-256: cee2920646f308360436fba2098ceed6f4a150f129248186055bdc3466c6b86f
font_02_sfnt_off00015014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15014 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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