Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3993a69510959cb…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 08:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ffd644aa96140d236b94bd61dd2b7059 SHA-1: 2476ea5b310eeb6f67703cdbf2886cd3943845dd SHA-256: b3993a69510959cb53bb4adb907997fac13983c95680b81526c68b2f0778dd6c
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of disposable URLs, indicating an attempt to host malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into downloading a password-protected archive, likely to bypass security filters. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kindergartenhelden.at/upload/file/firalifeziwererajut.pdf In PDF document text
    • http://constantemails.com/userfiles/file/163111638485649329110.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/20205138854.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/10697726190.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/48610816199.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/kotoxapawowaf.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/61640962623.pdfIn PDF document text
    • http://unseretochter.ch/images/file/37864209951.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/9742243176.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/29859021227.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/jalowewederumopi.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/pidolidorekijikiraf.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109120015029843.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/xinawezunulavatapo.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/83972257879.pdfIn PDF document text
    • http://eva.am/files/60e2831b7dd80eb6.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/39920756989.pdfIn PDF document text
    • https://virker-ikke.dk/files/xexediruwaxebej.pdfIn PDF document text
    • https://digicpictures.com/downloads/30611324912.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/netaso.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d743a8bf98---wemuga.pdfIn PDF document text
    • https://hirurgija.me/files/63826473657.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/buxijogovebagase.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/gaselutezep.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/97480314901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+black+and+white+randomizer+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_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 10844 bytes
SHA-256: 30d3789375c616f127f71f74c6a610db32e335b48e33c42e6d61344b22d2cdfd
font_01_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 18820 bytes
SHA-256: 469d2c93b7f52157345b43560dfcb016909e037f4bfb5e908f2aaae4407534ba