Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d20f7c955627f9…

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 14:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7e4938d26e4040dc0c0d2b6c07bd814 SHA-1: 817a97cdf9df6ea6080d075bfcd131459cea44a0 SHA-256: b8d20f7c955627f97caa1135bd892630d4b15fed43c9ee5e5b404e9f9daaddec
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as link farms or disguised as downloadable files, suggesting a phishing or malware distribution attempt. The presence of heuristics like 'SE_INVOICE_LURE' and 'SE_PASSWORD_ARCHIVE_LURE' indicates social engineering tactics to trick users into clicking malicious links. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wastran.ru/uplcv?utm_term=medicare+claims+processing+manual+chapter+4 PDF link annotation
    • http://bularz-auto.pl/images/userfiles/file/zanivoteganomebi.pdfIn PDF document text
    • http://rcot.by/pics/files/tarukoximotebikafubesumi.pdfIn PDF document text
    • http://carszana.com/image/upload/File/zumigis.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/6675834671.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/70637748835.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/megubenofek.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613390ce4aaaa---64654679423.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/93116011428.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/11320921578.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/79731214146.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/piduzewej.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/39961773614.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/68285249031.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/94534290340.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/bilomupelazo.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/guzomizizitofidawopi.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/83615159402.pdfIn PDF document text
    • http://allier-genealogie.org/File:/73996184613.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/40087900931.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/sobipamigojurowugemazoje.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/misidade.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_off0000c2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F3 11132 bytes
SHA-256: b71e0f8f2d6bac470fde71591782edfd7a1b46dad18c3abb1430c52eb37ab9ab
font_01_sfnt_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 17656 bytes
SHA-256: 650d8f2bc273e61117a6ab6295c4762b932b06f135e274fad2aeb98ac89123c0
font_02_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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