Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e00d3fae3ef1326…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 15:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df44ec6d49a22e1d81586d2391db4bd1 SHA-1: 1e097a3d1eca7da3d1e6adc1e93961454cb9aa9c SHA-256: 3e00d3fae3ef13267e6b36cf303615c31487292b145a17c7dd0ccebe86f1ff7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The sample's structure and numerous external links suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/bosapopexopab.pdf In PDF document text
    • http://prime42.ru/userfiles/files/taduxe.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/mugoduguvewero.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zubon.pdfIn PDF document text
    • http://goldia.cz/data/file/13013005704.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/72408255398.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/60247796525.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/nugidato.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/96314965210.pdfIn PDF document text
    • https://educhina.mn/editor/files/bedakeko.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/75b44a753007fafcedef9f328c78e223/85861296886.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/julalozajedebebixidaseg.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/64203610241.pdfIn PDF document text
    • http://cocoal.com/uploads/file/xazumusuvodoxifapawukix.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/64926507771.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/xemudanawad.pdfIn PDF document text
    • https://telorgabus.com/contents/files/65090926784.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/nobekuwifonopaseware.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/43563245523.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/28918776192.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-17/20210917061039611942.pdfIn PDF document text
    • https://epiphanych.com/images/file/32861058251.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109251356473259.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/jibevivipejepimadone.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuguxobinaverabog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=holding+up+the+universe+pdf+read+onlinePDF link annotation
    • 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://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_off0000b1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B7 10932 bytes
SHA-256: 72f16cb5b0b1f6d636bf5da577bef6831dbf4fe73132266236b8a65840e4f58f
font_01_sfnt_off0000cabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABD 17496 bytes
SHA-256: ea50d8f77de33d8e4e8ac591480374e7ec6f7d5f6523ba86781c55e7bdffb05a
font_02_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1