Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d4f170fb29804b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 19:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ca3841add62fcbcd3fffb1c5bb1f671 SHA-1: e9a9876f71b6278e31390df11173b283b10bc86e SHA-256: b5d4f170fb29804b59a320323054831aa10712c7d5e2e1657b490b6c3233a776
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to obfuscate the ultimate destination or spread the malicious content across multiple sites. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://a1climbing.com/userfiles/files/memumenuruzejudalelavere.pdf In PDF document text
    • http://venusland.vn/app/webroot/img/files/vatekikowobadimix.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ebd817bdd---sadirukuwe.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9u1c4buu306ue4r1k5javc96a3/gekafevakogok.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/mixina.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/zuzoruta.pdfIn PDF document text
    • http://russia-ex.com/gamajomupatiw.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/gusenagabade.pdfIn PDF document text
    • https://gangnampools.com/contents//files/13193537398.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/82766599895.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/raxuxejekutiw.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/32418026470.pdfIn PDF document text
    • https://luminex.pl/upload/file/pipepofem.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/74888354270.pdfIn PDF document text
    • http://belloverde.net/emailer/file/jokolopixatotejovozatu.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/93860757952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=oxford+english+for+careers+technology+1+teacher+resource+book+pdfPDF 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_off0000ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 17396 bytes
SHA-256: c76e80575a811409775cb5e8091e30dbcb42ed11f42f49d94f43f2dee08431bf
font_01_sfnt_off0000fb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 11524 bytes
SHA-256: faf81512ed27637935b27599f16fa1e96d33e450d103a5e54bc43285daa9dc6b

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