Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6be512c77816ab3…

MALICIOUS

PDF

74.1 KB Created: 2021-01-08 00:51:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 40f7f9f3302d80ed970f59c5b2e6aeb0 SHA-1: c77f63bb5451bfe6490d4b4bd84ede6ea6f7a2db SHA-256: e6be512c77816ab3a7fd4003b3ebfd387e9dadb80651a95a887fb0a250395a05
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with 'https://traffine.ru/123?utm_term=bank+of+hawaii+kailua+oahu' being a prominent example. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest an attempt to redirect users or manipulate search engine results.

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=bank+of+hawaii+kailua+oahu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418370/normal_5fb7fe117d574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f925fb3968ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413585/normal_5fccd3090f3c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_5fe92727ec0cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_5fa93afad9d70.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/sepavokokadudivazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447450/normal_5fe0c2c5c3284.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/57648a95-6c2c-4953-aba5-c3d2dafab8e4/47043591110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231c2ae0-b686-4a3b-b6b1-4ddbdc0672ea/70811853427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03004b6b-a7fe-4963-adaa-c510f88e54d3/filipino_18th_birthday_debut_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91711557-250b-4c42-a8af-77649bdf9be8/lunurulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07554279-4aef-4e98-96f0-a9df0f7d86d5/10296855041.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

Related samples 2

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 4788 bytes
SHA-256: 644bc6844b78243e2ee22ee3ae4c59e9ced074fbf5cf60769697907b8e0e5521
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 11724 bytes
SHA-256: 1d5facd2792ea8e0c3c6da8a93c4ff74211af9e229d780a9e308148de65ad6bc

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