Malicious PDF — malware analysis report

Static analysis result for SHA-256 40390c48f8c95be7…

MALICIOUS

PDF

67.7 KB Created: 2021-02-26 01:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8e638a1cab5f258bae5e47ed7bf049b4 SHA-1: 7441cb1a3a9271b6986a710dba5b1b4e832df186 SHA-256: 40390c48f8c95be72707d8ad936ede724c880a9f22ac8d8460db74a15050d245
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to household repairs, designed to trick users into clicking malicious links.

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://druttle.ru/123?utm_term=how+to+replace+a+dishwasher+door+spring PDF link annotation
    • https://cdn.sqhk.co/fekolisuzub/dQbiiic/50618517162.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/kiss_the_rain_yiruma_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/jfihWie/cardboard_sheets_michaels.pdfIn PDF document text
    • http://larebalin.mypressonline.com/ryobi_backpack_blower_ry38bp_parts.pdfIn PDF document text
    • http://xusonawifofi.iblogger.org/create_org_chart_google_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/dhjsDhf/heart_rate_analyzer.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/HJhafhb/21489969234.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanunir/UhjvieW/notes_app_for_windows_8.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/bbg_free_workout.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/fronius_symo_20._0-_3-_m_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/dupont_corian_sheet_sizes.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/paloma_tankless_water_heater_code_c4_76.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/cloud_9_volbeat_lyrics_meaning.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/zifafezebupuxogafafuf.pdfIn PDF document text
    • http://nuvafakidem.rf.gd/57637895851.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/countable_and_uncountable_nouns_worksheet.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/best_mech_in_battletech_tabletop.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/66224997568.pdfIn PDF document text
    • http://jexonuwunow.epizy.com/mcmaster_phd_supervisory_committee_meeting_report.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_off0000cf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 5388 bytes
SHA-256: fd908abcb3f3a1a6bc1f08e183887d80519a475c0608b9ebb38b35f31a288d16
font_01_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 9368 bytes
SHA-256: 6a992f85cf8d6c6e5d17edc6e59d9b837a2fe9afcf3898de3b1f923c4a422dff

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