Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50663fbef9d34da…

MALICIOUS

PDF

69.1 KB Created: 2020-11-21 18:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 86549b510e86340c32d8e05308a85c52 SHA-1: 66a2e48ea7b2b744453a585f9065958229f87361 SHA-256: c50663fbef9d34dacd64564417839c0a2360e7c8559b41f29193db6bd0385460
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=mvc+interview+questions+pdf PDF link annotation
    • https://ninukiwipovesot.weebly.com/uploads/1/3/0/9/130969879/lubineli.pdfIn PDF document text
    • https://fufijejelido.weebly.com/uploads/1/3/4/3/134351462/9299163.pdfIn PDF document text
    • https://sosalikibagog.weebly.com/uploads/1/3/4/8/134856993/2709259.pdfIn PDF document text
    • https://nubarosu.weebly.com/uploads/1/3/4/7/134726157/zejifim_zadizifib.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/tadovu/upsc_anthropology_syllabus_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/brain_part_controls_balance.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/form_a_sentence_with_absolve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03769f46-d542-4274-be13-247f16a73ac0/34988162369.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/tarikh_pembayaran_gaji_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6587a487-c1ab-403f-9448-4aa3729189fd/experimental_economics_journals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e44541-a3b8-419d-9222-29862aec182a/unblocked_games_76_ragdoll_runners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe023d3e-835d-4179-b39b-78847cd3ebfb/nejerisotinaxunosatun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300a87e9-2259-4689-8326-0fd8798fed9e/91988495426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7735ebaf-e288-4bc9-a511-1260f414f1f6/fubamo.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_off0000d242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 5188 bytes
SHA-256: df61b0044548e1e7149e0c3f140e2b8f8dfb7244a849c6905014a4d95bed9d45
font_01_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 10568 bytes
SHA-256: e733a497aefc13bf7e54163d4e287c171117da2ae9a80c7cd1bb9a7ad11e2558

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