Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5b68078427a036…

MALICIOUS

PDF

71.0 KB Created: 2021-09-17 04:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 973a1accc6525be3af635b36a1ca29ad SHA-1: 18af013844978a5ee83e823b82cbeb5ac3a245d6 SHA-256: 0a5b68078427a036be913e5fb9410774cc520c0103ce187a84aa2d5a6fe782af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many pointing to suspicious domains and file paths, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's intended to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gruaszarate.com/ckfinder/userfiles/files/fidoze.pdf In PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/nasaxewopalitetomedex.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/26311113535.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210907033542.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/46869943270.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/47414873351.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/41564366193.pdfIn PDF document text
    • http://umartravel.com/files/ditubufabivik.pdfIn PDF document text
    • https://empresa-venta.hr/files/davusonupejasul.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210901223807613.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386c3a36238---wobopeda.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/34131850361.pdfIn PDF document text
    • http://deltools.com/userfiles/file/dukir.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/5231327066.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/dunajagelalorewuteg.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/75601275728.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/63357257886.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/68300125257.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141446ed7bf2---namevofaxejoma.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/bazoxojiba.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/sikotowupumarojetopija.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/35425775373.pdfIn PDF document text
    • https://masukpt2.com/contents/files/14027505285.pdfIn PDF document text
    • https://trexanh.net/upload/files/95360140924.pdfIn PDF document text
    • http://ore-processing.ru/d/files/6637700616.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/marurixizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wetv+apk+download+latest+versionPDF 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_off0000b58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58F 15860 bytes
SHA-256: 87d4012ce092a7afd196da45e1c0cc48175633a1d790582969d5227182df88b7
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 10620 bytes
SHA-256: acaf945cb79923b37c8e69a378532fef16ce2906a7e750fb26c30c09c866e0d8
font_02_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1