Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79cace9e1290373…

MALICIOUS

PDF

78.7 KB Created: 2021-04-07 09:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 968c1888b76cc85d841bcc9d7bbb4f7c SHA-1: 5067e035b5abafb87bb1d13e1dc91c7a7be9a5a8 SHA-256: f79cace9e1290373481fab78b6310143169482753dfaf0c2f35547c5beb8049f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The primary URL, 'https://seumenha.ru/wix?keyword=supply+side+economics+crossword+answers', is presented as a search result, likely a lure to direct the user to a malicious site. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=supply+side+economics+crossword+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451929/normal_601b44afeb6bb.pdfIn PDF document text
    • http://megantv.site/coleman_battery_guard_lantern_1000_lumensbxc4m.pdfIn PDF document text
    • http://easycreditscore.info/medenokunuxuxuperevaxukhnigx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489843/normal_60549ee6b6620.pdfIn PDF document text
    • http://damvglaz2.xyz/garmin_etrex_venture_hc_hard_reset72yz7.pdfIn PDF document text
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/joledumavulok.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/j4Nmn27/touch_n_go_top_up_app.pdfIn PDF document text
    • https://ximipozatapemo.weebly.com/uploads/1/3/5/2/135297631/tamakenira-dirigararapal-zebiwovufin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_605ef645b4bb0.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/hhFujdY/ten_facts_about_mars.pdfIn PDF document text
    • https://woperuxotuxolo.weebly.com/uploads/1/3/4/8/134849923/mejefalikefipu.pdfIn PDF document text
    • http://copyrights-notices-helps.com/togajenikokudagakef3fkob.pdfIn PDF document text
    • http://rafale.store/91252699428slnsq.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/8740408.pdfIn PDF document text
    • http://buytoday.cc/xakubimalowikakeligewatg9jgn.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/Cjaje8A/cyber_knights_rpg_elite_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fowujizul/fgdTiff/57239876812.pdfIn PDF document text
    • http://pek-24.cc/rifiritimulis0iip.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://nojagemegoxeda.22web.org/51385108653.pdfIn PDF document text
    • http://triple-doska5.club/computer_hardware_abbreviations_listfqsu5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusunikumejimet.rf.gd/nufunodiw.pdfIn PDF document text
    • http://sapumazolexu.epizy.com/fun_guide_toronto_swimming.pdfIn PDF document text
    • http://dulubuli.rf.gd/google_chrome_for_pc_xp.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_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 5516 bytes
SHA-256: 78c626dbdc1327458e53694ee401c57a1d6bfad53030b5b4650f5b53b8647408
font_01_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 10800 bytes
SHA-256: cf28b8fd1ce3b6177c8cedc7445896a2dad67ed6bc3798990e50dc4a73151fa6

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