Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d853634eb73b1c8…

MALICIOUS

PDF

63.7 KB Created: 2020-11-17 20:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 37a046834dea2c82ba633815d25dbef0 SHA-1: 701f1c01e8b4bcdea43663cbfcfff74fb3b81596 SHA-256: 4d853634eb73b1c8bbd48a7dc34a43617cfc33fb4ff15f96b1a0cc7287c87306
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://traffking.ru/123?utm_term=tree+diagram+questions+tes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452599/normal_5fa71b9d4a2f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5f8839ac8d094.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/62359cebce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5fa9a1c7cca4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_5fa7317a8f07d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5f937aaa137aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5f97970ade243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5fa529d44c1f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/myrtaceae_family_characteristics.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/41468881332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8aa1a2-d1ea-4887-b967-226f631663f4/burewobijesududulefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b35ba4-d4eb-4f60-b9ce-7c9652d2c1ee/15421502077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0674bfdf-ea52-441a-843f-6619f578f772/luluviniposu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73fc9519-3025-4b6a-9e6f-4fa6f2edc433/good_luck_in_korean_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/minecraft_apk_java_edition_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AE 5188 bytes
SHA-256: f905f4274a085aa6f4043773a2e707f29ab465baa2d023d1ea14265970cebaba
font_01_sfnt_off0000c42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42C 3128 bytes
SHA-256: 7a84c6cf4f46d4bac8fb6ba896b1cdf686c60a6b9912cc82b79a416172af7d16
font_02_sfnt_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 9572 bytes
SHA-256: dd0ec4542cdabe6497a26a3b8aa9775bd8acfd5ac5db3d7153f60bf05c1c01f9

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