Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b6b1fc22c97514…

MALICIOUS

PDF

81.0 KB Created: 2021-03-14 20:25:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 16f3e766f37490913a87b68cce3f2779 SHA-1: ab6ab84c01209ca55321dff7e5231fbc90f555e6 SHA-256: 56b6b1fc22c97514092cf70c4a404beb7596a0218fa6757cbb54f77792b0a62e
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV and an ML classifier also flagged the file as malicious, specifically as a phishing trojan. The presence of an external URI suggests an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=mr+coffee+12+cup+coffee+maker+programmable PDF link annotation
    • http://mokaxizekebade.scienceontheweb.net/xajuzuboxewidubovov.pdfIn PDF document text
    • http://ezfix.asia/cricket_tournament_registration_form_2020n2dc9.pdfIn PDF document text
    • http://grinallex.shop/857178707923lruj.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/duraflame_infrared_stove_heater_with_remote_control.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/TjcjhBn/difofutowowuwukesiwi.pdfIn PDF document text
    • http://rodina38.ru/brighton_football_match_report92m7u.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/efZieig/lipomuxulonovokogi.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/shakespeare_sonnet_30_sparknotes.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/idhjjjR/jawaban_puzzle_box_level_13.pdfIn PDF document text
    • https://cdn.sqhk.co/xurilopotun/Q9Z0bic/brene_brown_braving_worksheet.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://nafezot.epizy.com/80952892960.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/innisfree_sheet_mask_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/87826177201.pdfIn PDF document text
    • http://gefuwaw.atwebpages.com/is_percy_jackson_real_story.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/penguin_anthology_of_twentieth_century_american_poetry.pdfIn PDF document text
    • http://rilimopukalus.rf.gd/fbla_competitive_events_study_guide_2010-_13.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/83942946123.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/ldn_muscle_cutting_guide.pdfIn PDF document text
    • http://xutewedosobu.rf.gd/23046728000.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/bleeding_time_and_clotting_time_practical.pdfIn PDF document text
    • http://koraxirimaxodet.epizy.com/kindle_fire_hd_7_4th_generation_user_manual.pdfIn PDF document text
    • http://dukizovisepo.rf.gd/wuxumimav.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_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 5200 bytes
SHA-256: 031f9d7dc5587ecaf503238fad349740ae1aea928cdc575ef49d9eed72f4d9b8
font_01_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 11072 bytes
SHA-256: cee6343e345c525bb941e3627be76e4e859acaeff1591eb71d6ecc899c02169b
font_02_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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