Malicious PDF — malware analysis report

Static analysis result for SHA-256 d031cecfbdad550d…

MALICIOUS

PDF

84.2 KB Created: 2021-03-27 09:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2e376a135d70a53d3096edc116d29bd9 SHA-1: 18dd27508f60fb7a7f1153ff4f04d83eea49b974 SHA-256: d031cecfbdad550d4da612dfe8c9b681f483931f20c525a8473e001dd70bc252
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://bologen.ru/wix?keyword=john+c+bass+elementary+school PDF link annotation
    • http://tryse.xyz/xalexebigazinonafamkzu6.pdfIn PDF document text
    • http://tetoxukipim.getenjoyment.net/45232562011.pdfIn PDF document text
    • https://cdn.sqhk.co/kobamebexog/ghjh0he/wind_spinner_won_t_spin.pdfIn PDF document text
    • http://damomemisogadex.iblogger.org/87704403460.pdfIn PDF document text
    • http://new-volosi.ru/repevazabevozojez5cjhk.pdfIn PDF document text
    • https://cdn.sqhk.co/dudavizi/eBjcs9Z/48530861629.pdfIn PDF document text
    • http://lovepositions.info/rinnai_rur98i_parts_diagramh0bz7.pdfIn PDF document text
    • http://nusobuxiwu.iblogger.org/nafuvodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotolag.epizy.com/accruals_balance_sheet_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/remiputowavobugu.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/94664090263.pdfIn PDF document text
    • http://nerofote.rf.gd/wuzokavilibudidawum.pdfIn PDF document text
    • http://botetuvixomidiz.epizy.com/86476472685.pdfIn PDF document text
    • http://lonogukubof.epizy.com/guitar_chords_for_dummies_free_download.pdfIn PDF document text
    • http://dulubuli.rf.gd/pubepemadofumozatome.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/51368286171.pdfIn PDF document text
    • http://dexivovadoxexo.myartsonline.com/3195718181.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/palepupazopewupibidi.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_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 5268 bytes
SHA-256: 275b3f4a20f197c19a34dc5cff89a8cf4cd4f6aa7c787e9e42b3c8927911c332
font_01_sfnt_off00011e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 11168 bytes
SHA-256: adc6f4dc06750da9a549e617e4c2bd666513aa238aecfda8fd88ce85ed29b7c3

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