Malicious PDF — malware analysis report

Static analysis result for SHA-256 91059e4496c17708…

MALICIOUS

PDF

75.3 KB Created: 2021-03-21 00:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 77ffa02e40a232fd1e40801341769ab2 SHA-1: ec41f45ce20f0dde82c9abf98df35c3f8c0ac806 SHA-256: 91059e4496c17708853e98467881221562f1b55ad644d4dde315f8901e95e6c0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the document body's reference to "nba basketball games unblocked at school" suggest a lure to drive traffic to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/wix?keyword=nba+basketball+games+unblocked+at+school PDF link annotation
    • https://rajizoru.weebly.com/uploads/1/3/1/8/131856770/670337.pdfIn PDF document text
    • https://zemomopefiku.weebly.com/uploads/1/3/4/6/134614162/penifoposopog_lalek_dejaxumawonun.pdfIn PDF document text
    • http://vavimaj.iblogger.org/92589236344.pdfIn PDF document text
    • https://jazasamiwuri.weebly.com/uploads/1/3/4/8/134889091/zerelipepuxofa_nabidijuvagetet_vubapevi_badipi.pdfIn PDF document text
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/fokusiroferapotit.pdfIn PDF document text
    • https://vavinaxedekofew.weebly.com/uploads/1/3/0/9/130969509/406a363415e9f90.pdfIn PDF document text
    • https://fanamiwa.weebly.com/uploads/1/3/4/0/134013174/jisebadubupozusilo.pdfIn PDF document text
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/tavinefal_bumogasuvis_lawigulened.pdfIn PDF document text
    • https://toxavepudu.weebly.com/uploads/1/3/4/6/134634724/2458376.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/dudifiwejovabafataz.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/8a5a015f-8e88-4de8-8556-e397c03e3c36/4234103784.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_858f71f5cb6c4c8b88a81385e91cd530.pdf?index=trueIn PDF document text
    • http://tepaduvofevog.rf.gd/42059384853.pdfIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_c63700c6da4e4237a7eda989dde981e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e478d5-592b-4c04-9d33-22351270117e/lujudebovarikasewobijogi.pdfIn PDF document text
    • https://0404cab7-c021-4537-be79-420bcb2f88cc.filesusr.com/ugd/52c240_414b5ef21296426c9c3dfde8e15cb2f0.pdf?index=trueIn PDF document text
    • http://sapiwitug.epizy.com/municipal_solid_waste_management_notes.pdfIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_e1c0492abf4442d5af29814e392559f7.pdf?index=trueIn 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_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 5432 bytes
SHA-256: 01ad451f78347c76977982eb39b08b29ebebe9bb5934aa2c08a49b45a8da8fb2
font_01_sfnt_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 10820 bytes
SHA-256: ae68cb42b81f8f021870b79b503c91c70bc405c45efc3c76a4e87b1e13f06f08

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