Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63d22e51a4c191d…

MALICIOUS

PDF

77.6 KB Created: 2021-03-07 14:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 812853adf4b01db33001f6266cd02408 SHA-1: c5384ebf925ebf482508bd53b7056525961dcd79 SHA-256: d63d22e51a4c191dc6eeb841498e4f1da99ffbb6a053063d48180712004c2390
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a link farm with numerous external URLs, including one that appears to be a redirector with a UTM term. The primary purpose seems to be directing users to potentially malicious or SEO-abused content, consistent with phishing or link-farming tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=does+tracfone+do+wifi+calling PDF link annotation
    • https://cdn.sqhk.co/sumavevop/nzgfFja/live_wallpaper_hd_for_galaxy_s20_plus.pdfIn PDF document text
    • http://fasodotujane.iblogger.org/msi_motherboard_bios_update.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/gchbKe0/ted_bundy_wife_liz_now.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/0GAeYig/etsy_pop_art_pet_portraits.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/56065c20-2e7e-410f-a7ed-58b4825a2111/nj_common_core_standards_ela_grade_3.pdfIn PDF document text
    • http://sixexelotu.epizy.com/harry_potter_quiz_questions_house.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_1f90f00ae5b34de78a6ec1a877725aee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb88a02-dedc-47b7-a2b7-d1e38cbc52a3/3221168317.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_fe64d0b9c00b47bc933b4a7616e93f13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f5f549-aa25-44e2-bd43-50f4235af178/40283847926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98bc7b18-7624-4538-a395-5e4157d8fe59/what_does_the_economic_interpretation_of_history_mean.pdfIn PDF document text
    • http://xafofeb.epizy.com/jpg_to_converter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc5c886-c2cf-4c43-bc9c-e59d4f44b2c3/31934787021.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_4e1ef43bf845451fbef3553fee3bcf28.pdf?index=trueIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_1643e28b85a94db186b09a532a692d5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2702bc45-4e08-45c4-95fd-008282e04008/85439890673.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_8b5e0b77255942388e4196089a806ff9.pdf?index=trueIn PDF document text
    • http://xagadikexebixa.epizy.com/fugunefajawunuwujoxeweze.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_d925f40bede44ed68c8fa3808a5a1834.pdf?index=trueIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_ee002682d96c4323a1c010be5653407f.pdf?index=trueIn PDF document text
    • http://bimivopi.epizy.com/aortic_stenosis_management_guidelines.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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 5280 bytes
SHA-256: 0c2c0f2087350bcd23d40bc8fcac5a66e6297da05121ce799344b6dca0e72d05
font_01_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 10832 bytes
SHA-256: 3e5f48778246004d409d755295f1f06aba59aa144d43161683dcae0a2f7c554d