Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac4a682a2cdf4af…

MALICIOUS

PDF

68.0 KB Created: 2020-12-04 14:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3afe99c1f869624beaaea775bffa3029 SHA-1: d7794b56e599734620d697717c23a9d220388450 SHA-256: 5ac4a682a2cdf4afdd39f6a2c39f089b20793ab1ca19b4a50f6ad1b5fd528578
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=triangle+similarity+practice+worksheet PDF link annotation
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/5374371.pdfIn PDF document text
    • https://ruxesewafemowur.weebly.com/uploads/1/3/4/7/134761388/0c650b.pdfIn PDF document text
    • https://jivoxixipilekok.weebly.com/uploads/1/3/4/8/134885045/cc16a885.pdfIn PDF document text
    • https://dipedupaketi.weebly.com/uploads/1/3/4/3/134333799/3754331.pdfIn PDF document text
    • https://legawugo.weebly.com/uploads/1/3/4/5/134509979/bivipejojefogilo.pdfIn PDF document text
    • https://mifajuga.weebly.com/uploads/1/3/4/7/134732675/puwugopariger-kedumufuj-xagipovige-dipiza.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/c65e0be72b29.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://uploads.strikinglycdn.com/files/d2a309f7-1d30-4a36-a2db-4660e00d1de7/nixamewavuzamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e40b81d-7c62-4363-8e36-ab52b4b9eec4/getaxeledujupud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5be088-c92e-497f-961f-88f499193b81/pevaludegusoku.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/the_panti_sisters_full_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/castle_clash_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9572670b-33a8-4d53-90bf-555aea02940b/fairfield_daily_republic_obituaries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642d5dd8-5c29-4b12-aff4-3e4688875a00/8067815816.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_off0000c188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC188 5344 bytes
SHA-256: f815b18646252c3925f53153ad20e22ff9d0a9f0fef2a02a342bfe4bb4d0f037
font_01_sfnt_off0000d391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD391 9644 bytes
SHA-256: 1659991c60efa1e1a2332325a55861da61ccb2a9d7ca7d11d626d829725d07e2
font_02_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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