Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc4cb85c626d13a…

MALICIOUS

PDF

104.6 KB Created: 2020-11-11 13:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6120d3fcd6fd97b25dfd7b21b472bd27 SHA-1: e721e6934db06e1cfcb31724b7036978ef669d02 SHA-256: 0fc4cb85c626d13a9ede9117990e9396d58ea664114a5ad9997c85585fdc60fd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV detection and ML classification further indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/123?keyword=canvas+keller+isd+student PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406514/normal_5fa5a2e69305b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_5fa1b44aaa53c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f926032082e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_5fa6998d0edf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f9108a066358.pdfIn PDF document text
    • https://zokefipevi.weebly.com/uploads/1/3/4/3/134311683/vakipulekigo.pdfIn PDF document text
    • https://lesavudipuvu.weebly.com/uploads/1/3/4/3/134338744/8236953.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/sezutuma/my_cousin_vinny_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/how_to_write_a_divorce_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82ce4c9-84b6-4950-a427-9acb8fd9db66/namabijigulepegeluwazopi.pdfIn PDF document text
    • https://s3.amazonaws.com/welutizenop/significance_shelly_crane_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/fanore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dbf24da-307d-4cf9-8563-c1706399357f/govusov.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/sebape.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 13916 bytes
SHA-256: a41d411ecf8e82a4d0255e2f2237cfa37f94a00067c385c8ac3437666b0a8644
font_01_sfnt_off00014cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEA 4736 bytes
SHA-256: 32599e9aeea0a603de8ac1f293ae9056714ec0ef5cbb8f2f5ae38c0c560cf9c7
font_02_sfnt_off00015d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D10 12088 bytes
SHA-256: 0c2b69c7759c0bdda0d01b497b0a0dc4098a58f99b183c4b7f41701bfb77bb95
font_03_sfnt_off000185d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185D3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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