Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92dd83e07ceeca8…

MALICIOUS

PDF

78.5 KB Created: 2020-11-12 22:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4c0f37d528cd763407383c3bf09a85f7 SHA-1: d736bb9bd1287454f8fb8c9fc29e83c359d19093 SHA-256: e92dd83e07ceeca8dcacbff20d420942f64e7f24b813094aae3fc17b53194d50
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 0.9997

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://traffset.ru/strik?utm_term=list+of+irregular+verbs+in+italian PDF link annotation
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/4081067.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/muxuzukul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_5f9455b839514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408993/normal_5f9d6357f0356.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/kibavutibeved/ender_s_shadow.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/singapore_airport_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453b2b51-c433-4395-ab07-e65d20af4fef/momikevesirisojirivovef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0a3565-efdf-4016-8ded-2cd48f80e52a/modern_control_engineering_ogata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a21bd47-f0e0-46a8-8440-7ea8e391b888/19712348879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f554b00-a4a0-4aab-909a-f0a57047aef6/xamoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e984d0-9928-4a3b-8dd5-52bc5efeaa73/61400192486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6117d69e-2a45-4f18-9cb4-a73411704add/88734940055.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_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 5076 bytes
SHA-256: e3a0bff71f90562ed37738c8f73ef031107a2c2ea3f089e08feb402cc5c57902
font_01_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 11304 bytes
SHA-256: bc9ea959633ebda1351d1b4e7450d59b8075c1668ac975888307bfd42d7e80b3

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