Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bb1f0de2be017f…

MALICIOUS

PDF

76.6 KB Created: 2020-11-21 06:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a417485d5585b6c22221d90cea0a9b64 SHA-1: 91784761ee10b3f1e561fff637f3a80a743bb86d SHA-256: a3bb1f0de2be017f895daee1463f5af454d995b945764eb4e2d9b8809db641e1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafficel.ru/123?utm_term=joseph+granville+pdf PDF link annotation
    • https://sedidumorasu.weebly.com/uploads/1/3/4/5/134507492/fenew.pdfIn PDF document text
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/zekugimavixun_nedabisixamo_gavibadutom_kogajolotima.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3477349d-8a92-4732-8aac-6c04045db824/kapemomekilonavux.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/words_with_q.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/night_school_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0f04a1-801a-4c34-b083-db596ed98fbb/bigenurimokoj.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/msar_parts_kits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d876b7fd-54e8-4cd9-aff8-0ebea9e17852/92973771985.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/toxoplasmosis_tratamiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a98d80-c104-4ad2-811b-f424888e1f8c/masa_molar_co2.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/cleaning_company_profile_in_word_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e006fdb-6f61-4eba-b391-51a750c483d4/webster_s_dictionary_with_guide_words.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/1111_meaning_12.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 5352 bytes
SHA-256: ff6b3e22113196d1337aa5b6a69a9b2cdbc17b4eb96f8061f26f7740a5fa23bb
font_01_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 10952 bytes
SHA-256: 7a5f3277445c79e771bcb5c5c3dc2f0aa395b1a40cde3ac3e223f25d43de3897

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