Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d6988a2f994d55…

MALICIOUS

PDF

67.7 KB Created: 2021-01-09 10:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e26d9fc7086ecc86ebdc72d96de5a901 SHA-1: b8b10bad9bd3fdc6278d89d0d81754a5a97d1f42 SHA-256: a8d6988a2f994d552f93d28640c739b49d3124b06cc86ca84e8b65b527d4f7fc
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL that points to a suspicious domain, identified by heuristics as an external URI and flagged by a machine learning classifier and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to a recipe, which is a common tactic for phishing or malware delivery. No scripts were extracted, but the presence of a malicious URL indicates an attempt to redirect the user to a harmful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=barefoot+contessa+chocolate+zucchini+bread+recipe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5fa2feba7dc01.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/U7ijTvq/roxoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471682/normal_5fcea1f9b7cdf.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/ghIgfhc/5674775556.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/c7a93523-3042-4e65-9be8-5b16911c5674/athens_area_school_district_staff_directory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3dbd7e7-c33e-42e9-b29b-085c03415101/nailtiques_formula_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bca63b9-7546-4923-8dcc-3e7fe97ec235/179134684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e91f353-8741-4edd-ada5-c20ec8a5a08b/1938285615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a15bfa-be43-4347-896a-7d4523f7bdb4/what_is_jp_morgan_chase_mission_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657f863f-bbde-42b5-82fc-9635a0598172/sunofon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8887a0a2-3a71-4658-a8ac-1950ca4752f2/gx_loader_wii_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf7d2aa-b74e-4018-95df-5fac1b3c152a/1spotmedia_for_firestick.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 5480 bytes
SHA-256: d9e2f74a8ddfc33f5ac1aee3de71a44e49fd7210d38381dc2dc9fc7ae168ec2f
font_01_sfnt_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 10788 bytes
SHA-256: 2b90700937b86f9de47d89a1791ba8beadf290774bea796c261b304f138b779e

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