Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e0af97d028a1c7…

MALICIOUS

PDF

72.8 KB Created: 2021-02-14 01:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 31e0f53a9f4a2674bf215a9029696fd9 SHA-1: efb059d10aee5ca472d1a66348b5b374471787c7 SHA-256: f6e0af97d028a1c7b911340aeaa5b15e3a64867c087d849408a197f4381a2d90
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 0.9998

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
  • 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://seumenha.ru/wix?keyword=equation+of+perpendicular+bisector+worksheet+pdf PDF link annotation
    • http://zemawage.22web.org/volimijozugejesexisawabo.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/4LjbUhg/bujutedaridoxofuwabu.pdfIn PDF document text
    • http://siankaanmexico.com/mifizoxupajesudroa0k.pdfIn PDF document text
    • https://vozupawugenebib.weebly.com/uploads/1/3/0/7/130776609/3342959.pdfIn PDF document text
    • http://simcars.ru/kalyani_publishers_financial_accounting_solutionskbwus.pdfIn PDF document text
    • http://trokot-shtorki.online/47702028927g44tt.pdfIn PDF document text
    • http://autokenn.com/puxakinonefonogrk2j5.pdfIn PDF document text
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/samawovada.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/jjb3ge7/como_hackear_mlb_perfect_inning_2020.pdfIn PDF document text
    • http://seomagnat1.online/sonurumamemakuzisipubm5yw9.pdfIn PDF document text
    • https://niwarixetawozav.weebly.com/uploads/1/3/4/1/134108921/64ae9faa858de.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/kunekafejopoja-gizovesapo-jotizewuvonix-puropetugizu.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/cgXLieZ/free_bingo_party_games.pdfIn PDF document text
    • https://cdn.sqhk.co/ripowusaro/ggpBhf8/microsoft_teams_download_attendance_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zurabogefu.rf.gd/wixaduzuvuzedir.pdfIn PDF document text
    • http://fekunowan.epizy.com/tuvamitikarifu.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/99485222474.pdfIn PDF document text
    • http://fojamemu.epizy.com/keludomikote.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/89727046835.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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 5620 bytes
SHA-256: d1e4458e5ad596370d8a3ebaa6631f7d581176e5c4335a90016bab2ab11ff0bf
font_01_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 10428 bytes
SHA-256: b52773372010466b930816467b95fb13b9f41940bb869f6ecbcc4276c495410e