Malicious PDF — malware analysis report

Static analysis result for SHA-256 4edbcaa47d20916c…

MALICIOUS

PDF

84.0 KB Created: 2021-03-05 12:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9bab4a19ba17935f37353aaa34dd6995 SHA-1: 194479c06496f2184ef3e988daa108c92e8f52ef SHA-256: 4edbcaa47d20916c677846b70ec3a751410c3744c06b9cd95896ce96aef7a143
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the primary URL suggests a lure related to a common search query to disguise malicious intent. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

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://midufefew.ru/wix?keyword=is+gasoline+polar+or+nonpolar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5fd8b2ce351ae.pdfIn PDF document text
    • https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/461ebe0995d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477655/normal_5ffaef772ab72.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/29db7.pdfIn PDF document text
    • http://dodonutore.iblogger.org/gmail_account_remove_in_android.pdfIn PDF document text
    • https://tutobino.weebly.com/uploads/1/3/2/6/132695576/125998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_603f09437fffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_6037eb423afbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_600bc31acda23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_6024001c471f0.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://sazosubegus.epizy.com/papyrus_theme_piano_sheet_music.pdfIn PDF document text
    • http://juwijez.rf.gd/88638989687.pdfIn PDF document text
    • http://nivewuwasidurus.epizy.com/67329987996.pdfIn PDF document text
    • http://kitojob.epizy.com/musudesivulaf.pdfIn PDF document text
    • http://wufutogaj.epizy.com/simple_control_navigation_bar_app.pdfIn PDF document text
    • http://mijikudetixo.epizy.com/konagisilobo.pdfIn PDF document text
    • http://buketoxepebaf.epizy.com/outlast_whistleblower_viet_hoa.pdfIn PDF document text
    • http://lunujebof.rf.gd/xejixegi.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_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 4632 bytes
SHA-256: dac4c642e8b9ea3e75354fd5e6f038dc24af0c35892bd30bc0b0ffaa40138be4
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 10704 bytes
SHA-256: 5094a7fce379f131b6b1e1282484ba5d727a115f2970320457b258d50a78630c
font_02_sfnt_off00013527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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