Malicious PDF — malware analysis report

Static analysis result for SHA-256 17258a75496b2aba…

MALICIOUS

PDF

79.1 KB Created: 2021-01-26 00:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f46ce5ebe009c8cfc50c8b2aba6f2082 SHA-1: f9fdbf6b2cb93965aeca85230c0bc85771fc8f33 SHA-256: 17258a75496b2aba70495df6c88aa8c37d82f0b122a86e313ee30635b0a7cf03
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farms or phishing campaigns to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external links suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=westclox+alarm+clock+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416513/normal_5ff255da225fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5fdb03b2c3d80.pdfIn PDF document text
    • https://vewekazetuxif.weebly.com/uploads/1/3/1/3/131379326/1662215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490529/normal_600bfd7bf2cc4.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/xodituxeb.pdfIn PDF document text
    • https://dibevoxatatot.weebly.com/uploads/1/3/1/1/131164568/fogabikepisod.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/roxawo/samamibuxesevosafedasuvi.pdfIn PDF document text
    • http://kutoduno.rf.gd/74776909279.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/71272110482.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/usb_bluetooth_adapter_for_android_box.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/boxing_star_apk_free.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_off0000d206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD206 11352 bytes
SHA-256: e76c6a1810d139cd13b3510b07d5505501f8528783da8e4b0926e0b5f78b5ca9
font_01_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 5092 bytes
SHA-256: f8cb0d8f524c5f9edd08009d2fc6a9a68e46b451938585c3c00c8fa3e470b1a7
font_02_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 11484 bytes
SHA-256: 5a8e8caae5bb4ef637cebcf16f4c4409af810971c657b6c0b875a5e3e6050047

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