Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9dafccca2e91a3…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 12:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d891c6d3e5247681f19ccac2329e05c4 SHA-1: 6e0050909d34bb1b787d3121cb34307113086f17 SHA-256: 0b9dafccca2e91a33ee88f96884a611e7a5c234aba278c7821365c4e171b1f44
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=oxford+dictionary+of+idioms+pdf PDF link annotation
    • http://ekopaczka.pl/imgbrama/files/89900317907.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/46697338152.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/92768651922.pdfIn PDF document text
    • http://attlas.center/userfiles/file/54441676551.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/defawawi.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/62238717496.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/19176008309.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/52988503597.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/93739125643.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/lawaderojafofupipiwipere.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/fulevufakeki.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/5167798116.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/77516037108.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/visalobifu.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/45040307839.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/vanasafuwuzokowon.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/kudepijebapatefovogip.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/worifamavutimiga.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/latabetemokuxirivox.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/zigubefijugewevekonediv.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/kopamowerejupavodogata.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/vasisamez.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_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 18276 bytes
SHA-256: d5f93568173db1955f4294b9ba71d5551ee3e4d2e1a5a343ccee75680203dc87
font_01_sfnt_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 10844 bytes
SHA-256: 4a5ca6f4b499dab0cb3bc66af7955afaf6844351c837be513eb2a9ec794c1187
font_02_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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