Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8a6b7c2766fda6…

MALICIOUS

PDF

83.4 KB Created: 2021-09-11 21:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e2d000b13c4cc54a477c5b70ee7837b2 SHA-1: 3dd907226f6e9458b8eea066e47b1c1006d56422 SHA-256: da8a6b7c2766fda61f71aafa1ca8f19315527e9830545b643fc100d7d1ff581a
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious PDFs hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://luluscafeonline.com/uploads/files/potelenapuponuvoj.pdf In PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/gapetepawalisutem.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/nozarizojudeposedajojazel.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109091908212196.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/gupoxelose.pdfIn PDF document text
    • https://pepsima.biz/files/file/xogodofojekobi.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/siligot.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/91107230402.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109111243086509.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/purodamakusagu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/096a665a850aa1088326f0d07af86891/wifavirabufireginubewi.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/65514254479.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210907_C4B69473AC2142B8.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/23028585413.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/foranefipebowegu.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/10899585185.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///zagevomewofikojemimibag.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/22199301200.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/9642627046.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/disex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=instagram+following+viewerPDF 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_off0000d480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 10660 bytes
SHA-256: f086940eba95ee000d10759f2d24fc6166ea8c194b5456c13fb8406bc4dbd7ef
font_02_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 22500 bytes
SHA-256: 5f22a9daea4803e10aac8bba0a11241e39b1d33c8d6df926b34753f084cd2185

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