Malicious PDF — malware analysis report

Static analysis result for SHA-256 278a48d2567c4c69…

MALICIOUS

PDF

92.1 KB Created: 2021-03-17 10:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c8c1209799824358e18c9434bad0acd0 SHA-1: 156818fa0c73b6264ebd069256c5b3fbf532bb41 SHA-256: 278a48d2567c4c698d7c65c780a84b41c9a57359f46d1c1a0dcc3f99f2246dc3
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 0.9996

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://midufefew.ru/award?keyword=creative+and+critical+thinking+notes+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410006/normal_5ffaece516a20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477155/normal_5ff2b60b3d322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413238/normal_6003abad84898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_6025ff0d74595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369775/normal_5ff96c4667cc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418383/normal_604d3fd58fa56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417128/normal_5ff518216761e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fc88c04c01ea.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://s3.amazonaws.com/tufujifinobiro/49402610688.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/lutafugowoluwepixojixen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e6cbc7-9f92-4988-9d70-c7b3975818e2/17373649279.pdfIn PDF document text
    • http://fewuzefar.rf.gd/glencoe_earth_science_textbook_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6785440-d368-4808-a9bb-2f45675f69d0/what_is_the_lesson_of_flowers_for_algernon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de72e9d1-61e9-40cd-b674-3b7ecb9ebd19/when_to_answer_a_guys_text.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_ecff22c46fc74a80a9284beac7ff6a0f.pdf?index=trueIn PDF document text
    • http://rapabilalame.rf.gd/advanced_vehicle_tracking_system.pdfIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_3ac00b21e643481188f0f21c6aadfa45.pdf?index=trueIn PDF document text
    • http://siwerixu.rf.gd/92795739820.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/2687001865.pdfIn PDF document text
    • http://serobamemesazan.rf.gd/26310373535.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 5352 bytes
SHA-256: 9ed033c4fac4afccdc275ae92d46761509dfb0cc9dcd291c9ae372e90071d4e1
font_01_sfnt_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 10676 bytes
SHA-256: 225338171936496773b3e40d33377bd137fecf3a885f9b320631842250655e88
font_02_sfnt_off00013f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F18 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00015446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15446 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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