Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7187e3f2e177400…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 20:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30d4577a713ed61215cf93ea946230fe SHA-1: cdbcbef21969bc0658374b72be8bf018f8ee0cb3 SHA-256: c7187e3f2e1774008d2472be1b9c4d2efab459f0420b3de1e0086bf477403712
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous links to external URLs, with one specifically identified as algorithmically generated and likely malicious. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://np-laser.com/upload_fck/file/2021-9-9/20210909065640189807.pdf In PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/96839915060.pdfIn PDF document text
    • https://asi-filter.pl/files/file/wadav.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/wumukiduwojizipulixovo.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/8794939221.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/begumepedobesix.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/21262882878.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/tikifuxonivezirilunuveked.pdfIn PDF document text
    • http://www.centralperdana.com/file/81503072870.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/kimigofilixalidivil.pdfIn PDF document text
    • http://robbes.nl/media/files/laxoginozu.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/44804092202.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/kiwuxo.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/64902307572.pdfIn PDF document text
    • http://kelvista.lt/images/files/35600764368.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/87954502903.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/kopekopi.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/23693206750.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/9070278355.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/selipenuparijidelipa.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zubilapuzopem.pdfIn PDF document text
    • http://sbairs.com/datas/files/mepizusolomupulixikad.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/76030786103.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/62504252885.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3c2c456e---97094766060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hide+blocked+numbers+androidPDF 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_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 10756 bytes
SHA-256: a4829fb3831748bbb29c6a8e822aa2352df762de489e197e75b1be8eb236f192
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 18192 bytes
SHA-256: a9e51eba7faa6f6a34760f1725c60a050ffed8982084b8b7351a32baa35f3ec5