Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c989e1ce39e8f1d…

MALICIOUS

PDF

76.8 KB Created: 2021-01-28 02:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 03039b0c75d2bdbc05e4c5eb602f22ce SHA-1: 75c7c61d9158fb499f450255184ace309db064fc SHA-256: 9c989e1ce39e8f1d32c3bc797e560dc49c1fb402582c31099743f1f834169c62
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs, some hosted on disposable domains. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious or spam content.

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://leonvi.ru/123?utm_term=does+the+resize+mint+patch+really+work PDF link annotation
    • https://kowelisabames.weebly.com/uploads/1/3/1/8/131857626/59bff32.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/gcif0Nr/dog_sim_online_turbo_rocket_games.pdfIn PDF document text
    • http://geosen.net/1845363942owfc9.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/jhghgek/98421177290.pdfIn PDF document text
    • http://dontbeshy.xyz/swepco_arkansas_power_outages2f3p9.pdfIn PDF document text
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/fojokekabojibe.pdfIn PDF document text
    • http://replyua.site/63319457889mw67q.pdfIn PDF document text
    • http://martans.space/kaxurejemurujiho8.pdfIn PDF document text
    • http://lomigizukifomor.22web.org/41039012602.pdfIn PDF document text
    • https://cdn.sqhk.co/vofudejobif/OaBqEih/vowekotexanajezebova.pdfIn PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/tizenedudometet.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://gedamodeges.epizy.com/procedure_for_coliform_test.pdfIn PDF document text
    • http://jobiduleger.epizy.com/standard_5052_aluminum_sheet_thickness.pdfIn PDF document text
    • http://vegigekud.epizy.com/closed_cell_polyurethane_foam_insulation_sheets.pdfIn PDF document text
    • http://fitimulosegi.epizy.com/b._h._m_full_form.pdfIn PDF document text
    • http://jefelaxe.epizy.com/bloodline_ariana_grande_piano_sheet_music.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_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 5268 bytes
SHA-256: 12a8a1836c7bff4003e9d3ee8ab6e2bae03ee4bef209e048c2c62f3f6c100ecb
font_01_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 11248 bytes
SHA-256: 17c5843f4c5c9d1ba42cfcff1725429fc8a448945cbae55c681a5a99b8641fc1
font_02_sfnt_off000117cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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