Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b8348b9d6c0c44…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 12:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 05fff7b1c247eeb3dc0b25b2121e45c2 SHA-1: 18eac8078758cd2bc2d7cdc734ba5e4812f14a13 SHA-256: 38b8348b9d6c0c44549d900af0c4a2e87563b345982e22e682ce69ef84d1237f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/32e5f23d50e8531dd82b131f7d796a0f/pekinisezowetomonegawan.pdf In PDF document text
    • https://giaynangchieucao.com/userfiles/file/22873634748.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210902201100.pdfIn PDF document text
    • http://ergakiland.ru/files/files/ruwaputawuvotupimodovekag.pdfIn PDF document text
    • http://markalikonut.com/UserFiles/file/kokenalopuwugevigavefoza.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/tamubawutupupewasalakud.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/72438297859.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/40287727102.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/zadubokipeduvisabodupa.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/80351601441.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/vijefizewadalutonumos.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/xutefi.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/91327974020.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/30978272345.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/36507765278.pdfIn PDF document text
    • http://gro-felix.si/uploads/wigekusodezaw.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/pifalemepuxawuxuber.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rokab.pdfIn PDF document text
    • https://kiptep.ru/file/latixitiwimeroletijuw.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210928132630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=bhagwat+geeta+in+english+pdf+gita+press+free+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_off0000aef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF2 10916 bytes
SHA-256: e279eec6177a01926e241d26486e91b0226c9f3f867cc68d6c1bf1f53bbc00ea
font_01_sfnt_off0000c806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 17008 bytes
SHA-256: b5cca5052e1771814423f0fa6fecaaba7bd995e495f335eff59a6451e49b6e15
font_02_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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