Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a54243b83224186…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 21:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b68fb6473e2733153ebe48dfbb1d501 SHA-1: d55e26c12dcd0a7e8c51719a6879d8841a633359 SHA-256: 1a54243b83224186ad48c3e2dd5023075ee45b0b42c20057448ff8438d62ba68
146 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with several heuristics indicating a link farm hosted on disposable domains. One specific URI points to a raw IP address, suggesting an attempt to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://nutrizionisti.eu/public/thread/risorse/file/36173955048.pdf In PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/jarozizenajewakekusolu.pdfIn PDF document text
    • http://rooptex.com/uploads/87317661715.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/loripufugikimabasupori.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/bipipedaruluxa.pdfIn PDF document text
    • http://feminella.ro/upload/fck/93819198891.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/14935817484.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/37676286732.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/33610711484.pdfIn PDF document text
    • http://crm333.com/documentos/file/38076967005.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/45790824014.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/83524196997.pdfIn PDF document text
    • https://ratodua.com/contents/files/tivufekozugizuj.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/pefopilivojaved.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/38293288744.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210902_083756.pdfPDF link annotation
    • https://heuresromantiques.com/upload/files/59045951398.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/vexarasolomig.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/27073296282.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/moxawejepafonokokatipejij.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/livuwifuvoxumasitiwuf.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/75834854519.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613fef0383b34---47490659824.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/naweturezarijifadasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=henry+stickmin+collection+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 17192 bytes
SHA-256: 3e4c3a46c7018ccd551ca730225ca9fc6f7505a0b934896b96d886355f08c988
font_01_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 10732 bytes
SHA-256: 767dbcedb0a4f81ce77260b34585b1c867c6b3ec96752f256e6f114a640d2132
font_02_sfnt_off0001277a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1