Malicious PDF — malware analysis report

Static analysis result for SHA-256 3959dae265ecafe1…

MALICIOUS

PDF

77.4 KB Created: 2021-03-24 23:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 18c27c7cb7a959e7c441039a1cfbe4cf SHA-1: b03ece11dc6999c9018fed5e03d19109851b619a SHA-256: 3959dae265ecafe107fecb34f5193091a21c334010142acc1d91b7c623358e65
126 Risk Score

Malware Insights

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

The file is a PDF that contains multiple embedded URLs, many of which are hosted on disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=properties+of+adjoint+of+a+matrix+pdf PDF link annotation
    • http://miribut.mywebcommunity.org/zolezirugejetawikij.pdfIn PDF document text
    • http://solokekojo.22web.org/kuwujivagigumoviximer.pdfIn PDF document text
    • http://terogit.iblogger.org/ikea_bed_sheet_set.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/6488405061.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/daily_thanthi_news_paper_tamil.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/pinizonezinafesofopado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_bf6cc70bb3d44bf59020d9684334f1d3.pdf?index=trueIn PDF document text
    • http://fefekug.rf.gd/bacteria_causing_food_poisoning.pdfIn PDF document text
    • http://bidejepeko.onlinewebshop.net/99051251213.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/turebolulifozusibi.pdfIn PDF document text
    • http://pavabiza.atwebpages.com/banking_awareness_capsule_affairscloud.pdfIn PDF document text
    • http://dafukip.myartsonline.com/43755092958.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_10bfef22f1d74e1ebff06d76c52c064c.pdf?index=trueIn PDF document text
    • http://zivexotafoni.myartsonline.com/tanukafexobitafadem.pdfIn PDF document text
    • http://vuzefami.epizy.com/un_bon_petit_diable.pdfIn PDF document text
    • http://kawojimulogizef.rf.gd/gepoveboj.pdfIn PDF document text
    • http://nalasorujuwasop.rf.gd/lamaxexunof.pdfIn PDF document text
    • https://9169454a-6e45-4b39-89c4-5cd9bf0a6084.filesusr.com/ugd/32fbc8_0c948cf535bf4784ae97a69bd480a8d4.pdf?index=trueIn PDF document text
    • http://wonanikapudidak.atwebpages.com/website_to_app.pdfIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_21b387945a65442ba7626efba067627d.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
    • 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_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 5300 bytes
SHA-256: 4d187d46682234ea2e7f341d1c05e1769fe70d290998db18092bb8d6769fb279
font_01_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 11184 bytes
SHA-256: d3156abee0edabf7f5bb1b74b781bf51aa3744a5090ba372241b38ba3ad607c9
font_02_sfnt_off0001127b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 16276 bytes
SHA-256: 49bb1087c84d8682ae87f8a8f02cb5f1dc19280eb2fc3a2b35905785baaeb355

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