Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6ed2f7abe091c1…

MALICIOUS

PDF

75.3 KB Created: 2021-02-22 16:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 88cffb37bff0d62ca18607bac751261b SHA-1: 4fe1b89dbd57f9e9763fdc6ca406084e3afa9c2f SHA-256: 9c6ed2f7abe091c12076d34327ea14fd77bb5590b754bec07b9fd247df6b7272
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample's structure as a link farm on disposable hosting, indicating a phishing or malware distribution attempt.

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/strik?utm_term=brandsmart+usa+thanksgiving+hours PDF link annotation
    • http://uanews.website/spiritual_leadership_oswald_sanders_ebookqpdd4.pdfIn PDF document text
    • https://cdn.sqhk.co/walamalesumi/jgRhiON/freeciv_android_spaceship.pdfIn PDF document text
    • http://tirojegexo.iblogger.org/91478614140.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/abJffJ5/zebra_iq_color_label_printer.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/accessories_for_motorola_ht1250-ls3d6lb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458623/normal_5fe33498abb59.pdfIn PDF document text
    • http://wiinorama.fun/why_are_my_desktop_icons_locked_windows_10xad74.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/bhejgdo/formula_street_racing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444885/normal_5fd62402b1233.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisurav/bhjJhj3/call_blocker_android_app_source_code.pdfIn PDF document text
    • http://pihodze.com/4759356994793cmu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazegixedibuw.rf.gd/samsung_allshare_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/website_templates_bootstrap_4.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/fond_du_lac_reporter_marriage_license.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/codorus_creek_fishing_report.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/lojavenivobu.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_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 5380 bytes
SHA-256: 1fc6934f04ff3deabe18917b73725f10e43cc891205c35a56a9a20a795d52634
font_01_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 10640 bytes
SHA-256: 899c2a7ac580de42f7b8787c57726ccb3e2646263f56c8e339ff005b5356b669

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