Malicious PDF — malware analysis report

Static analysis result for SHA-256 942d72872191bcb8…

MALICIOUS

PDF

70.5 KB Created: 2021-02-17 21:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0861cb4adb3374b78bd8e05c54a88f3d SHA-1: 97cb2cb51369ebfc3b76464c04d698ba0f51041d SHA-256: 942d72872191bcb89d07ffa656e3ed6ae6f3c0f4fbc4f38867122975f06cba64
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=verbos+irregulares+en+ingles+past+simple PDF link annotation
    • http://alisabor.design/radio_rock_online_classicbvbbc.pdfIn PDF document text
    • http://allfreebets.ru/6981698773l8tt0.pdfIn PDF document text
    • http://opit.space/brush_lettering_freeadxkc.pdfIn PDF document text
    • https://sulakupewub.weebly.com/uploads/1/3/1/0/131070695/rupukuvikato-dawizanexu-konedozan.pdfIn PDF document text
    • http://teaapple.space/interrogative_pronoun_worksheets_for3i4ld.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/9047772.pdfIn PDF document text
    • http://goldenframecollision.com/45386089418j7q6a.pdfIn PDF document text
    • http://senteber.site/68344327525ryoq4.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/doxarudikidisiruz.pdfIn PDF document text
    • http://creditscoretrack.info/la_guerrera_novela_capitulos_completitw8l.pdfIn PDF document text
    • http://smotrikino.fun/fuvuro7kvti.pdfIn PDF document text
    • http://hhizmet.com/xukabefogivazojilakolu8adff.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/real_followers_apk_latest_version_2019yt086.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/4f4acd3c1d83b5b.pdfIn PDF document text
    • http://probnik1313.tech/washington_dc_rooms_for_rent_roommate_finderwl6c8.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/fodose/66768928241.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_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 5244 bytes
SHA-256: 3f7803531fc46e6bfbf277ce134996cf520c5c679cced9e86c97f51088e946c0
font_01_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 10636 bytes
SHA-256: e14691f39ea2e6207e767fa0a729579364b90d0d98b295b6adde7b06e7eb0d1a

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