Malicious PDF — malware analysis report

Static analysis result for SHA-256 825a031b1c5f09e9…

MALICIOUS

PDF

83.9 KB Created: 2021-03-23 06:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6f137babe1137bc67911a36fb6e93959 SHA-1: 51aea3f0fa4cedc7406c03b47d58cc0edbf5d422 SHA-256: 825a031b1c5f09e996d47d409abd0cb6cb1200c0194baa395e9e1f9c6d4fc922
186 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, and contains a large number of external links, many hosted on disposable domains. This behavior is consistent with a link farm designed to distribute phishing content or malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/award?keyword=computer+building+guide+pdf PDF link annotation
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/4a34de4d2b89a0.pdfIn PDF document text
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/xezamarugotisiruzam.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/df0ad89078.pdfIn PDF document text
    • https://webemimerur.weebly.com/uploads/1/3/1/3/131380848/54498.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/3978290.pdfIn PDF document text
    • http://wubujonil.getenjoyment.net/astaxantina_propiedades.pdfIn PDF document text
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/gulez.pdfIn PDF document text
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/3883175.pdfIn PDF document text
    • https://vojawozusuv.weebly.com/uploads/1/3/1/1/131164351/4982c54075.pdfIn PDF document text
    • https://zepagowixo.weebly.com/uploads/1/3/4/8/134887299/663985.pdfIn PDF document text
    • https://durafozo.weebly.com/uploads/1/3/0/7/130740533/tazepukadajedumunu.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/vilepudufabifur.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/233e1f84-f2fb-4a94-a478-c015607bc15e/wordpress_tutorial_bangla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f2d3391-9e99-4691-865b-01ef9ed34f0f/social_studies_mass_media_definition.pdfIn PDF document text
    • http://benamow.myartsonline.com/seminar_on_problem_solving_in_mathematics.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/72637645660.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/how_to_be_a_bawse_audiobook_free.pdfIn PDF document text
    • http://zivonupawidam.atwebpages.com/bowurewesami.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/wopiwebesewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11272dd3-c21a-4f46-92c1-399b67d54abb/why_does_my_logitech_wireless_keyboard_lag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3c864d-f1a7-41d1-a3a9-90e2ac842a06/jusiboju.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/94429064824.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/jusikiruxufaxexevozo.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/6478714755.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_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 5016 bytes
SHA-256: 2780f7be0891c7ccc9ee00ad1a1c0cc9589ee53879451191c87aa288562b1491
font_01_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 10704 bytes
SHA-256: c02eeaf7ef86d5ff7ee34dbe06e64239e9f6a2e9cca9c07530d3ebf9e4603447