Malicious PDF — malware analysis report

Static analysis result for SHA-256 963b95df2d6e931e…

MALICIOUS

PDF

78.6 KB Created: 2021-05-19 15:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f2d27dc20f66381824bec4306127ff58 SHA-1: e53aa7e45cb6904f799cacd444f4720c041374c4 SHA-256: 963b95df2d6e931ed9ccf7c62b7f8ab9b378ebda1eb6a258a504109f6aad90b5
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One of the primary links, 'https://yafferge.ru/strik?utm_term=c%25C3%25B3digos+de+control+universal+isel+u-47+hd', is identified as a malicious redirector. This suggests the document is designed to lure users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and link farm behavior are indicative of malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=c%25C3%25B3digos+de+control+universal+isel+u-47+hd In PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/53b4fd4dc7f2.pdfIn PDF document text
    • https://wudatoguji.weebly.com/uploads/1/3/4/8/134885495/630578.pdfIn PDF document text
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/fududalovusivu.pdfIn PDF document text
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/finomenenugop_simulazetomiwoj.pdfIn PDF document text
    • https://teworovesub.weebly.com/uploads/1/3/0/7/130775402/gifuzusagi.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/3817267.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/tafiro-jabadefufuku-lapisebi.pdfIn PDF document text
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/tulawobekas.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/c37a8622-4cc7-4937-8a7e-658ecfb30fa9/disavuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b245b9b-2b9c-4406-aa09-0d0990b1c1c8/60891875594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d61d15fd-27d0-4756-965b-93f0edfe0452/chrissy_teigen_cookbook_recipe_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46af5c2c-d30d-460a-8df9-fd705c331acf/mechanics_of_materials_6th_edition_beer_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/chemical_brothers_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aae225b-9a57-450b-99d3-550b2c821f8b/rosotunowudetaw.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/miller_and_levine_biology_workbook_answer_key_chapter_17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad99cfb4-3243-424e-97f4-b200b4f1a01b/99342692785.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/77029544428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fad4bbd-e0de-44c8-829a-c2d2c7edf0ae/razogifazefos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b8ee96-d44b-4492-8397-8b9d1f8ea229/43152236598.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/sejuwiladosukena.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/dungeons__dragons_-_curse_of_strahd_revamped_premium_set.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/851016668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3de152f-33f5-4abe-9874-de5e5dbae9be/18566279516.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 5504 bytes
SHA-256: e912c7a511dce4c890fdc065b6b8be75ccbae61988ac742147bac9c8530a2396
font_01_sfnt_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 1728 bytes
SHA-256: bc99ace54c25a7dd36b8ff65d2ff6cbdeee65b358bdc70c7bf96298ff5e8d1fe
font_02_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 11488 bytes
SHA-256: 7ebaa6e506bff1e169259883062f9f10e2c5e87492cb14d849ece9a7a7fbbd4e
font_03_sfnt_off000114c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 16196 bytes
SHA-256: 13873d145b8da2256cc9aff7ec32aedf7dd7de0e65fabb376e0f91dd1eea3996

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