Malicious PDF — malware analysis report

Static analysis result for SHA-256 e611d3986d5f3395…

MALICIOUS

PDF

113.3 KB Created: 2021-03-18 16:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e0b346c37950a16a704180820fe2a95c SHA-1: b0760e817006c8cd2a356beb939e33690fe72961 SHA-256: e611d3986d5f339540f06ac2ccf4845e545d77ef34a7eb7af170e7524eea3e2c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to facilitate the download or redirection to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://jacksth.ru/wix?keyword=kangaroo+e+pump+instruction+manual PDF link annotation
    • http://twoup-viktoria.online/79992824494ayjjy.pdfIn PDF document text
    • https://loseseseveru.weebly.com/uploads/1/3/0/8/130813975/dalowafebolebodejunu.pdfIn PDF document text
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/1223743.pdfIn PDF document text
    • http://wisitens.online/how_to_set_date_on_garmin_s6025kbf.pdfIn PDF document text
    • http://tricitysikhs.com/83177932188nxvcp.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/jggdSif/40813911105.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/organic_chemistry_as_a_second_language_4th_vs_5th_edition.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/bozewinemu.pdfIn PDF document text
    • https://cdn.sqhk.co/jivobukafon/xPWQiiX/5893852637.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/6581291.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_d75813452f8e4433a22517eb0a958dcf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98669b6f-e65f-407e-b154-0f5b82285208/vibrant_matter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f405f1b-e603-47f2-aaf7-2ee207198198/fawibefuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d76cf2d-9289-41f6-a1de-896938151b5e/complete_chemistry_for_cambridge_igcse_student_book.pdfIn PDF document text
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_71e9e91a2bc54822a5d3928d4a5f7cef.pdf?index=trueIn PDF document text
    • http://runuwug.myartsonline.com/77114010836.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_off00016155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16155 2260 bytes
SHA-256: 9bd30b12eac1ebf700775f25d95afd0e0bf7d8c339099f9256ad88395416c395
font_01_sfnt_off00016b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B12 5224 bytes
SHA-256: 99c71d3180ca7609614a3c641d29b1153c4f969f5639421cbc6cd81857cc4cff
font_02_sfnt_off00017cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CCA 19496 bytes
SHA-256: f525ba44c6c97901a414878cc24928c9bb35a0f1567536413e46629acdc0bb9e

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