Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4d46be220bbaf7…

MALICIOUS

PDF

73.2 KB Created: 2021-03-10 11:37:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7bb2cbe18693d47432fa1c8a9e8bc241 SHA-1: f1864db7459f5890b5857761d67512d6b583e6f2 SHA-256: cb4d46be220bbaf723abd59c0cc5277831e3e8f0f8e753941f1f8d5cf15de75b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to redirect users to phishing or malware sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/wix?keyword=hyper+carries+lol+s9 PDF link annotation
    • https://cdn.sqhk.co/mifopanikil/fDhhgha/31480130778.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417999/normal_5fff68b40f986.pdfIn PDF document text
    • https://cdn.sqhk.co/muwanije/jhbsUic/57280217035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420468/normal_5ffbc885281b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418963/normal_5ffea7918b44c.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/best_20_inch_chainsaw_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466657/normal_5ffe1402aebfd.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/NhjkYij/fixtures_champions_league_2019_20.pdfIn PDF document text
    • https://cdn.sqhk.co/daguvemet/c27p8gi/formula_1_2019_calendar_ical.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369311/normal_5fdda3c8b3774.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/joxukixi.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/fhjggae/super_jump_cheat_gta_5_ps4_phone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosurok.myartsonline.com/what_is_a_palo_santo_smudge_stick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2578f0-75ac-4d75-8a30-8d280c93907c/what_is_ac_joint_osteoarthritis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1059579c-bf03-4ed9-8f7c-bf122b1bc0e3/zadef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d6c266-6f4b-4c72-a0d5-a0f3b792decf/how_to_google_search_a_picture_on_android.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_8091650c475c4e06b579f39e0ef202f0.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_6ca009c65c52412ab3cdc6d66cdd5299.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/773eb77e-62de-4491-ae25-2b7b7fa08bb2/3347691099.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_d5316a92c8414e3cae35d03c0151e8fa.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_3a2250e3a9ed4528aa3941ea394685fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b63aae-a216-4f92-ae9f-66cbd7ae16f3/sample_interview_questions_and_answers_for_executive_assistant.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_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 5148 bytes
SHA-256: 5e9c9fa4e2c6a8fcaa77d0bc64df11edadab270eb6822b7a199b4cee2c6eeaa8
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10012 bytes
SHA-256: 460d223c2d17233c8ae92f718a569604f50c3c3b28b638ce14315af9dda84353