Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81320d6d14b3d13…

MALICIOUS

PDF

65.9 KB Created: 2021-02-24 12:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e4834bd42ee47ce8838a56330141240f SHA-1: b8a54487691a75847d7b0dba36621ebb60cb86e0 SHA-256: f81320d6d14b3d13e27cc689508df633719021e68ba73e8d203bc36cb94bfd54
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 0.9996

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://crophysi.ru/wix?keyword=matching+exponential+graphs+and+equations+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/tategupet/ja4BldZ/trim_3d_object_autocad.pdfIn PDF document text
    • https://todumubisopid.weebly.com/uploads/1/3/5/3/135312552/vekipu.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/ijhDDgd/paintball_usa_linglestown_pa.pdfIn PDF document text
    • https://tererenigi.weebly.com/uploads/1/3/1/4/131405956/634996bf8247fc.pdfIn PDF document text
    • http://oneitshop.pro/minecraft_handbooks_onlineoryoh.pdfIn PDF document text
    • http://bas-vorota.ru/rililujofakilemfr7d7.pdfIn PDF document text
    • http://hookup154.space/amor_eterno_sheet_musicf04f2.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/fhcgedl/spacex_stock_quote.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/siiifhb/legobos.pdfIn PDF document text
    • http://timecodes.net/levitu7em7d.pdfIn PDF document text
    • https://vafomelopujoxo.weebly.com/uploads/1/3/4/8/134864043/12203695c3.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/5djaCmt/37238401931.pdfIn PDF document text
    • http://vasugixoba.22web.org/94275979660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dezologukow.rf.gd/unearthed_arcana_races_2021.pdfIn PDF document text
    • http://biwajitakawa.epizy.com/why_my_brother_printer_is_printing_blank_pages.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/guideline_constraintlayout_example.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/9671008031.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/brabanonne_paroles.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/telugu_private_album_audio_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/effective_presentation_techniques.pdfIn PDF document text
    • http://xadamun.epizy.com/contemplate_meaning_in_gujarati.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_off0000c582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC582 5688 bytes
SHA-256: 1bcb80e339356e437b16c153a88ca24f13e1b7c34537e0e037e3999655604ebb
font_01_sfnt_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 9556 bytes
SHA-256: 21840bf2e6609ad4ba5db1658675c6ce001061a73d92f1491d5d1114de057ca5

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