Malicious PDF — malware analysis report

Static analysis result for SHA-256 819be01b327da934…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 11:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bd406e2c5a122d813c10cfb6fc787608 SHA-1: 1e98ec52ce99c7fbc636eb566aeb38305d23fa25 SHA-256: 819be01b327da934d8bf958199c4ebd983c091269c9d7b4e9849c44090a8b6b1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, many with UTM parameters suggesting a lure for software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=minecraft+pocket+edition+maps+download+android PDF link annotation
    • http://aven.su/userfiles/file/mafowojilodufob.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/56966491631.pdfIn PDF document text
    • https://betsin.org/userfiles/files/89380324283.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/48856168958.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gekekato.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/9784253565.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f127b747cf7e55fc174f0aff1264abc8/migafanerulekagobolisifa.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/xogukekidokinuwonegebala.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/65579432721.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/8135801235.pdfIn PDF document text
    • http://capital96.com/userfiles/file/66118985544.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/20801395314.pdfIn PDF document text
    • http://aven.su/userfiles/file/6990970782.pdfIn PDF document text
    • https://nistd.in/userfiles/file/49335462081.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/bezetimurufozejolajoje.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/diteweduvo.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/3205872829.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/0c356f626a9e858fdb341a9bf7002d7a/zomisonetij.pdfIn PDF document text
    • http://bakoca.hu/files/file/56489234686.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/1763132429.pdfIn PDF document text
    • http://17njl.com/userfiles/files/bexezofugikurewexagurusi.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/nitodajewijodorovif.pdfIn PDF document text
    • https://petikdaun.com/contents/files/nomudabiw.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/zapixeni.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://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_off0000c756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC756 17264 bytes
SHA-256: db18899f66f4d6125fe2b13f7cec05aa01548a53357fb8fc192065ded724db72
font_01_sfnt_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 10952 bytes
SHA-256: 4ca9344c31536377cf0f020ee3e5fb4193860fdf614223c8e1a84b3f57c9be9e