Malicious PDF — malware analysis report

Static analysis result for SHA-256 540d99e4fcc21ccd…

MALICIOUS

PDF

67.6 KB Created: 2021-09-25 07:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ec862053ad93bb168218a5fb1816b78 SHA-1: cd13ba932049324b1df9553939089c202c9b4284 SHA-256: 540d99e4fcc21ccdedf305aa9ecc526c4c115b8af2fbc0b7432355cc434a221d
154 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, employing an image-only interface to obscure clickable elements that redirect to external URLs. The embedded JavaScript stream and the high ML classifier score further indicate malicious intent. The primary purpose appears to be directing users to potentially malicious websites, as evidenced by the numerous external URIs, including one that suggests a download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 67 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://krisoc.ru/uplcv?utm_term=download+bazar+android+4 PDF link annotation
    • http://contextuae.com/resimler/files/26777918362.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/72483289305.pdfIn PDF document text
    • http://capital96.com/userfiles/file/pimogilonisipazarokad.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614298e263cf3---92308961971.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/57343106675.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/25056343544.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/66310883732.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/bowutobetadikenevebamiw.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/1848614164.pdfIn PDF document text
    • http://paradoxine.com/upload/files/nobifomab.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/26446161688.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/72594570301.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/mutoniranijijiwasane.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/zujuj.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/kewudofivimovef.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/14171693915.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f862f91fcd---zudevotepegitubivozu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1614912e601bf8---rapexanunitijuzabe.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/79606412813.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/14352030390.pdfIn PDF document text
    • https://subded.org/userfiles/file/12402415756.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/20238526585.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/23050340415.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/80391454082.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/gipalivusopoponi.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_off0000ae8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8D 10208 bytes
SHA-256: 6527c3072f4ceee29c98ba8b4ac22b9e5b6570ccfb37a1978416e20a7ddca672
font_01_sfnt_off0000c590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC590 14252 bytes
SHA-256: c95b910b807dacd2782f82257840e94e7ca09c62652b4f0017e2ddf57f619b52
font_02_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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