Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab3c5927d756827…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 02:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf4d0b415cb5a23595b17cdd1105be76 SHA-1: b9af70c687d2efc52921bedf238ff60e65f3a0b2 SHA-256: bab3c5927d75682707ab5ba59f766160bc1dc2ed859ec45c27980b77d8d834af
174 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and presents multiple links to external PDF files hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://manpukuorder.com/uploads/files/88401915059.pdf In PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210906_C0503ED4EE78722D.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d93a0bceb---21253300215.pdfIn PDF document text
    • https://csn-alliance.com/data/files/84907051206.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/kemoveniboregal.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/3661910813.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/95075454486.pdfIn PDF document text
    • http://askort.pl/Upload/file/29660116869.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/56496182107.pdfIn PDF document text
    • https://equimat-cheval.fr/file/31189504651.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/tosamoselozusutaw.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/96588206030.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/6082281380.pdfIn PDF document text
    • https://cet.sk/res/file/pozozidawevenutinemosugaj.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/mizivuzekajamij.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/97510041954.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/xigozejugojipevoriveban.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/jikapoduzi.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/roturorujopoxasabifovebox.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/wobewug.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/zuzidavenamogibejugov.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/wadujopitugawumam.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/koxakarojaxogex.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/sinoj.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/46049897962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=fifty+shades+of+darker+full+movie+downloadPDF 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_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 17660 bytes
SHA-256: bdc5ae4e1dc0436f559fd6d717b8ee04db8a06d27d392d70a1d1b50658e92b88
font_02_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 11052 bytes
SHA-256: 0a6f91a9fa31415aa473926b3efa83829f7c354d1a89a0763d6b3b5c4ac8dab6

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