Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c2d28c06c7431a…

MALICIOUS

PDF

70.7 KB Created: 2021-02-21 08:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 65372829b335e4e42784accc0956938f SHA-1: a34119d3fa4991c807ae89d2fe954041b1d0058e SHA-256: b8c2d28c06c7431ad8e9a35b1e5ef552121bc7ccdc5e5256f04e6f8c77808c32
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector, aiming to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wb?keyword=possessive%20reflexive%20pronouns%20exercises%20pdf PDF link annotation
    • http://wugafis.66ghz.com/partnership_agreement_template_new_zealand.pdfIn PDF document text
    • http://ttttrrrr.space/tigulowabodotovimonerixfzit.pdfIn PDF document text
    • http://remastacer.com/alien_swarm_free_for_pc8ix2s.pdfIn PDF document text
    • http://mon-cmbretagne.com/download_iqiyi_videos1jrm4.pdfIn PDF document text
    • http://hangookoil.ru/jisukapomipubijipijd2w5k.pdfIn PDF document text
    • http://shoop-ft.ru/learning_english_for_free_at_homelk535.pdfIn PDF document text
    • http://trylait.club/what_is_art_integration_in_the_classroomaj4pz.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/luratew.pdfIn PDF document text
    • http://idealicaufficiale.website/19278173993x4zwm.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/kamawifepajijasagoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_600f8dd7d2692.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366309/normal_5ff5d2ba5b759.pdfIn PDF document text
    • https://nilelaji.weebly.com/uploads/1/3/0/7/130775665/kopepewegokova.pdfIn PDF document text
    • http://metazoaapc.fun/36667408554wed7i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_602c3466d5485.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411250/normal_5feb243d8256d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fekobovovexi.epizy.com/11797304025.pdfIn PDF document text
    • http://raxusitusumulag.rf.gd/95561451851.pdfIn PDF document text
    • http://puzejiruniri.rf.gd/nolawudunofimu.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_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 5068 bytes
SHA-256: 2daad8db4dfa62bbc1d7ff5c501be9877e1afb98f0b4b4a6ae61dd0e31e69045
font_01_sfnt_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 10496 bytes
SHA-256: 66703913615811d0d5ac4a3e108b9fa1d0f1b1cc30fc6d5e5ceb4cffc080e47c

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