Malicious PDF — malware analysis report

Static analysis result for SHA-256 59910b8fad292b44…

MALICIOUS

PDF

70.2 KB Created: 2020-12-17 16:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2edfe23cd37ed229ff47796c098faea5 SHA-1: d548a718f3100f64a03d493e41070db5f980754d SHA-256: 59910b8fad292b44c8edfaaaa0dc3cf386c11987601be7438374f2f724a3161e
214 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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=new+balance+black+friday+code In PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_5fc203a55d7ab.pdfIn PDF document text
    • https://wuwoxidip.weebly.com/uploads/1/3/4/4/134492879/koropadulovoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_5f941d3c7cf1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f89e5b6d9257.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a1d3026f-4f7e-4c99-ae5c-e3d75b5a6efb/luwevupetulowugu.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/sample_action_research_in_english.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bc293dfdd95b60d440d6/t/5fc26fdc3c02f22b9d5b9bd2/1606578141350/spotify_premium_apk_2020_no_root.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27955e99-f6bc-420e-9028-b3469882b605/loniwasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a971ebc-8e65-41f0-b200-ccac8f2e51d1/failed_to_install_hcmon_driver_vmwar.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/2237538522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aba9d10-6f31-41c2-be29-66f022b2af90/5991204181.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/raw_calamari_nutritional_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/729b1837-317b-4545-a487-db93eb2cb40a/flujo_de_procesos.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc17c913dfdd95b60d93bb6/t/5fc5c18f4f98375720a64b20/1606795664096/zelos_tales_of_symphonia.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_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 4912 bytes
SHA-256: 13e343cac91ffb9b4796ebfb1c17134e44fbc4665d3eafc70b6865ee5c7aa0e5
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 10632 bytes
SHA-256: 4636a8b95d7708536294e1ded8dead702592ac703dbf0bf25b1b4bce171c8438
font_02_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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