Malicious PDF — malware analysis report

Static analysis result for SHA-256 c793bccc35ce0f18…

MALICIOUS

PDF

85.6 KB Created: 2021-03-04 02:21:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1c6b63b4b5aab179f7ea223151f65ad8 SHA-1: 3d65671dd13da9141e26ac8b4cb03b956855da7e SHA-256: c793bccc35ce0f185d49b4d0f8f5ce7633bd02c0ab5c93ece9d0d883150eccc4
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://gimoguvi.ru/aws?utm_term=should+school+be+capitalized+in+a+sentence PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470968/normal_5fe3f2346d47e.pdfIn PDF document text
    • http://bukobaxaz.getenjoyment.net/68269423535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481513/normal_6012423900c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494673/normal_5fd68d0a8240b.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/how_do_i_manually_backup_my_kindle_fire.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/hjAja9u/kejinom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483337/normal_5fde18007d1cc.pdfIn PDF document text
    • http://gebikomuxe.getenjoyment.net/45275402848.pdfIn PDF document text
    • http://topshops.website/vmware_certification_roadmap_20185q9vf.pdfIn PDF document text
    • https://cdn.sqhk.co/nonobepimaf/ZijhgCV/12604476349.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/zokugimirazepuwaxewij.pdfIn PDF document text
    • https://zowozenuzaf.weebly.com/uploads/1/3/1/8/131857278/xeleg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373502/normal_5fe01978915b8.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/kuxagaxem_fozetefala_dasipumeda.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/hp_m2n68-la_motherboard_manual.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
    • http://xolavozezimodan.onlinewebshop.net/fagirikipivewefewokula.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/science_of_mind_core_principles.pdfIn PDF document text
    • http://zorikeroz.onlinewebshop.net/85966310090.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_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 5240 bytes
SHA-256: 7b205a45d44a367e9cf8894901e0bf98d8c1ccc39f7970cd88e6778498f0192b
font_01_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 11200 bytes
SHA-256: 64cbbb4fdec78eec05ceed86965559d5e2b7da9316a0ffda223f5c97dfe1dcc3
font_02_sfnt_off00013a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A51 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.