Malicious PDF — malware analysis report

Static analysis result for SHA-256 4105265bcb7ede7c…

MALICIOUS

PDF

158.4 KB Created: 2021-04-01 10:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 45cc55121f4899476e35361a3f7d6fd4 SHA-1: 20105b26cf0eaf378f7a445c64ac63356e185adb SHA-256: 4105265bcb7ede7c6dd475c3629daaba41a58a055a0ca48f8aafe8524550be05
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 strategy to host many links on low-reputation domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nipisod.ru/123?utm_term=unilever+nigeria+annual+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385235/normal_602055277da5f.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/is_everyone_equal_before_the_law.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/16276586365.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/73785985524.pdfIn PDF document text
    • http://instahelpforbusiness.com/motorola_xts_2500_portable_radio_chargerbueo7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387424/normal_5ff18f1fcc9af.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/percy_jackson_film_online_cz_titulky.pdfIn PDF document text
    • http://ing-cliente.com/74667233182umteh.pdfIn PDF document text
    • http://toletisugudasa.iblogger.org/lalopadib.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/lange_psychiatry_10th.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/how_to_calculate_structural_column.pdfIn PDF document text
    • http://meetly.space/6886459878hhv0v.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/sabovalojej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekusisit.atwebpages.com/77934595303.pdfIn PDF document text
    • http://gijafusatuvaxoj.rf.gd/ap_studio_art_2d_drawing.pdfIn PDF document text
    • http://jowawotivedalox.rf.gd/why_is_my_delonghi_coffee_maker_not_working.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/pabekoju.pdfIn PDF document text
    • http://jopumogezev.epizy.com/micrometer_depth_gauge.pdfIn PDF document text
    • http://pidusagi.atwebpages.com/activated_carbon_market.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/vonshef_manual_pasta_maker_instructions.pdfIn PDF document text
    • http://jexovisejaj.epizy.com/mepexixanagonegatizabule.pdfIn PDF document text
    • http://fozozip.onlinewebshop.net/microplastics_in_water.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_off0002323f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2323F 4860 bytes
SHA-256: 25854e5aea70f3205a3d78fc2623f8ee1950c94052e2f5f2e649bf34afe5d9de
font_01_sfnt_off000242e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x242E4 12092 bytes
SHA-256: 6c971d35288b6c02fcddfa4fc662e8de5aa4fab649c282318f8796fb07071578

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