Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cb28ca7dc06141…

MALICIOUS

PDF

82.0 KB Created: 2021-02-28 09:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b0e22ba1474f614e4918cd70818deab7 SHA-1: 2a387620c43590516004939978e0792a3d682bf4 SHA-256: 78cb28ca7dc06141be6be539c2b0541cf933f726b1ae7e420a8a5d6578ef523d
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-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://fokemale.ru/strik?utm_term=can+mainstays+bowls+go+in+the+oven PDF link annotation
    • https://cdn.sqhk.co/paxepedamaxa/ivIjfo1/wovuzowoso.pdfIn PDF document text
    • https://verosogoteri.weebly.com/uploads/1/3/4/7/134738646/6066784a9.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/pedevivimejomomafow.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/types_of_bowline_knots.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/Uihiagg/captain_pick_fantasy_premier_league_gameweek_6.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/Gzjghib/shreya_ghoshal_tamil_songs_download_sharechat.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/81056106918.pdfIn PDF document text
    • http://gratoramaa.space/why_does_plate_tectonics_movekelhq.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/bojalu.pdfIn PDF document text
    • http://bestcreditcheck.info/xegujawuzuluwio99c.pdfIn PDF document text
    • http://losmopaka.site/kexagurugafozusonibisux3ma3.pdfIn PDF document text
    • http://raisinsapp.club/guitar_chords_for_hindi_songsn3kby.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/rule_12b-1_plan.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/5714675338.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/fgfhehe/25748176445.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/bizutiwubajimug-gumisu-pezonabevi.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://geforagegi.atwebpages.com/pefel.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/73475286065.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_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 5208 bytes
SHA-256: 4b2ee0bbc5f94bab759754105bea42062d48c254b29e5f55a77575330fbb4f22
font_01_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 10844 bytes
SHA-256: 0d1c2ac1bddf258d028be08f041e533065afc067b4562b078a80310dc96982d1
font_02_sfnt_off00012d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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