Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03754713603d924…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 13:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea315052120057487e45a920252a8712 SHA-1: 4471d68ecafdf8f3d57b7f21e941acadd4eab6b4 SHA-256: a03754713603d924b7daa60c8056063f27cf8316db15be9a78931ac9874a34ce
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to potentially disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eggtesting.com/admin/uploads/file/6203732418.pdf In PDF document text
    • http://baigeleather.com/userfiles/file/vuvizabokotetaboredomiwim.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/vosamizenenagiri.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/45678761453.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/fasesomesobixazabewowatu.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/58017268123.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/73455868636.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/vimatu.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/vodefumuzesadadatidotilim.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612fe0053ce58---sebujaxe.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/gobumesuzelu.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/1953701961.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/19226320065.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/96401161381.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/81397733662.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/96633232197.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/sejaluzoku.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/15288476545.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210908_B3787A8CCDBF9883.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/jolezoxebozodita.pdfIn PDF document text
    • https://anakmeong.com/contents/files/6785524204.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161333ddce72c7---kupogezuxasot.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/59699911857.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/04eb7634f86596879daee745cc6334ba/xotufiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bheem+race+mod+apkPDF 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_off0000bec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 17220 bytes
SHA-256: cacd15ceddc823925dbe52a869d5acd8f4c042079a0d2053659b4fb0309d48a5
font_02_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10416 bytes
SHA-256: 8baefc67aff151e0310673ce9871991c8646b708163b02f615991ce3ace95967