Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06139ee5335e4f8…

MALICIOUS

PDF

88.5 KB Created: 2021-09-08 18:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b6c64c579ec6c820b413624da3d4793 SHA-1: 89e294cbbdd627506a9c668e6fc888bbaaf94e00 SHA-256: f06139ee5335e4f86167f38b6f0e606930193be9aca089f8ec1f45ca677dcfb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=kandungan+lumpur+lapindo+pdf PDF link annotation
    • http://hooleihomes.com/cms_images/file/1037677662.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/64437260491.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/11c8f7ab53b74394bb6efcd843c21ce8/vuxinelenukelubiluz.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/busuradavirokekuraxaza.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/49089649780.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/zazaxe.pdfIn PDF document text
    • http://xycrusher.com/d/files/bopodavusekanisijivazu.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/puzatuzigijuzujamo.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/golutidujomixuxuredujaxiv.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/2381401353.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/voruga.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/52301542155.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/lirugow.pdfIn PDF document text
    • https://cian.hr/userfiles/file/91616077329.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/91104294899.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/dibesewemosusi.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/taramabuto.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/31285814087.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/91786904456.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/32680128006.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/43067687618.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/tijuwakoxotibuj.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/67899072802.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/nefodufijigukotitajadime.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/92548090350.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/rajonulalozu.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://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_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 18148 bytes
SHA-256: 781c575b1b4717a72238b3d95fc7cf6d1449de663adc8e4ee10adae2569c3698
font_01_sfnt_off00012463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12463 10532 bytes
SHA-256: 85654877659f3b74036a846f934140eab8ac7c71ffcfb3e9add336c99c91ca95
font_02_sfnt_off00013bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1