Malicious PDF — malware analysis report

Static analysis result for SHA-256 8778f8d0e662110b…

MALICIOUS

PDF

84.4 KB Created: 2021-06-11 20:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d57d24aaf82d08fb5844e27ef0fe8acd SHA-1: 04f0575fd3e13d94c3a4e35382aa50066490eb32 SHA-256: 8778f8d0e662110b5426db9900a059c790ba11d59a1be6ad92edfebf728a3925
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://catamma.ru/pbw?utm_term=differentiability+implies+continuity PDF link annotation
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/zazobuzozususijo.pdfIn PDF document text
    • https://bamigifumu.weebly.com/uploads/1/3/4/4/134443618/9876483.pdfIn PDF document text
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/6913612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_6060ba3c19b13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fe1a787cdbad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_602f3b3222890.pdfIn PDF document text
    • https://wezifujizofuji.weebly.com/uploads/1/3/4/9/134904593/5166433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410443/normal_60453a6029267.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/cb683b5e-c109-4c9d-ac7c-e8e9b5ffff52/jebiluxapuzagitifiti.pdfIn PDF document text
    • http://fawugomem.pbworks.com/w/file/fetch/144637791/makkar_ielts_general_writing_download_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f292eb6-c0a2-4b8f-bd1b-ab9230e185b1/31292368615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1db4cae0-8c82-4d05-9064-aee1a4b115e1/what_are_the_different_types_of_psychological_tests.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23404cc-f280-4c73-a83b-8f7a9e09507b/semiologie_de_lappareil_respiratoire.pdfIn PDF document text
    • http://momukaduwe.pbworks.com/f/bigegivizaxuxajurilakur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0507d9d-ab6e-4b7c-b00b-6d306e1337d2/parts_of_speech_examples_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f12a2879-b2a1-48af-9d35-6157683955da/john_deere_d170_54_inch_mower_deck_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97bb587d-fa6f-477b-a2c0-a77c8342bedc/55273518310.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144883797/how_to_check_battery_life_of_inpods_12.pdfIn PDF document text
    • http://jasiduvegulu.pbworks.com/w/file/fetch/144602022/how_to_detonate_tnt_in_minecraft_pi.pdfIn PDF document text
    • http://rawumadakora.pbworks.com/f/dutika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea49667-10e5-4a4b-9162-4d3d77bf96c2/16684974822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ea6a6a-213c-4b74-8283-7dc8a5bd2608/30705788391.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 5404 bytes
SHA-256: 73dac3f032ae22ca10429021ed9d8b75d6161b471fd8567f2e56ca35eacb6b39
font_01_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 12032 bytes
SHA-256: a93a9a9c9e891269cf2150690e888df81ebd851c8ca8cdef34fdb0c65ccf8e3f
font_02_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 16228 bytes
SHA-256: ddef3cd99c1ddb9bd298fd567d548c7c8dff061ec3289c367ad82234479e81d5