Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b7af460a8c9d72…

MALICIOUS

PDF

75.0 KB Created: 2021-02-19 15:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: edfff15d6069ec760511f53c74a7135e SHA-1: 60993314476ae978a31e0828776440fbddd46dd3 SHA-256: 21b7af460a8c9d7283c685c5747860dd1ba7577f77a67ea321083e678e76af08
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to host malicious content or redirect users to phishing sites. The presence of 'utm_term' parameters suggests tracking or campaign-related activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=sql+query+example+two+tables PDF link annotation
    • http://8gusevshop.space/heading_matching_exercises_ieltsfhose.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463263/normal_5ff1db0874416.pdfIn PDF document text
    • http://xeboxemovev.66ghz.com/news_greenland_ice_sheet.pdfIn PDF document text
    • http://white-x.fun/wufufivjtf4x.pdfIn PDF document text
    • http://xokewekababawa.22web.org/satco_led_fixture_reference_guide.pdfIn PDF document text
    • http://storeplus.pro/warframe_steam_achievements_synce7qfv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478923/normal_5fef0e591c39b.pdfIn PDF document text
    • http://stebsmeh.space/libro_abdominales_hipopresivosjhld0.pdfIn PDF document text
    • http://gmetry.online/vosudagik75bzc.pdfIn PDF document text
    • http://toteganutiv.66ghz.com/what_does_bi-_monthly_report_mean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_5fe6cf1e84c52.pdfIn PDF document text
    • http://freds.space/how_to_cook_vegetables_with_pastaav997.pdfIn PDF document text
    • http://ejinaya.com/468433978337f41k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_5fe7e71f74e1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabotiwufonego.epizy.com/fifth_edition_character_sheet_app_ios.pdfIn PDF document text
    • http://miruwofewap.rf.gd/42974722346.pdfIn PDF document text
    • http://bumemelowogo.rf.gd/53748704595.pdfIn PDF document text
    • http://livufuxe.epizy.com/fowotusomigig.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/common_wombat_fact_sheet.pdfIn PDF document text
    • http://bevamixebigal.epizy.com/coping_cat_workbook_free.pdfIn PDF document text
    • http://lajirobodogew.epizy.com/benefits_cancellation_letter_template.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_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 5596 bytes
SHA-256: 423376c05eca975555ba09b0a029d471702e253ae08087b7ce9ec77b5d3e2bd9
font_01_sfnt_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 10684 bytes
SHA-256: 23ec2810a16e11599f558fdb29e3d6e87526d7d11cd417e55578231fa0cf4045

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