Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a91f23f607c281…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 05:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9b92d9a1d741c3c054a666ec11d19f9 SHA-1: 9928c9479e285137c99a1aeb2ea349453775c236 SHA-256: f5a91f23f607c281e3a434f8809edb908dd36de34cb0f328295c6683f0f3ff6b
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-only appearance, suggesting a user interaction is required to reveal malicious content. The document body is heavily obfuscated, but the presence of JavaScript and numerous external URIs indicates an attempt to redirect the user to a malicious site for further exploitation. The ClamAV detection and ML classifier further support its malicious nature.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ganganagardentist.com/userfiles/file/felobavonuvamavep.pdf In PDF document text
    • https://tierlistei.ch/downloads/jiwakajuta.pdfIn PDF document text
    • http://liily.jp/upload/file/20210919111004.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/76632748302.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/75737057229.pdfIn PDF document text
    • http://demkapi.com/resimler/files/40307039397.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630478868.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210902134249016932gvf04n6ya1o1.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/roferirin.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/duwukikuruwogipukos.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/nidevimadafajujenerunuxa.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/56093648829.pdfIn PDF document text
    • https://taperagi.com/contents/files/remuxifokek.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/sowipe.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/todeguridodamuxoviwaro.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/doseniruw.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/39384922668.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/morivug.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/bobidawana.pdfIn PDF document text
    • http://usmleworkout.com/files/file/87448717864.pdfIn PDF document text
    • http://namngonviet.com/user-/files/jomoxefitaregawavim.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/85611310422.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/4127248091.pdfIn PDF document text
    • http://mylodge-naoshima.com/24131652120.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/47120177827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=playaholics+swords+and+sandalsPDF 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_off0000b2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 13776 bytes
SHA-256: 84b64b74f843da6306a097b148221a80206c39422b150c3b5847a8a5f9057fc8
font_02_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 10436 bytes
SHA-256: 642ea3ac17180b93f213cc53dee3e97e34ccc2479c4bdeceb01959582c1431ca

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