Malicious PDF — malware analysis report

Static analysis result for SHA-256 675a044fb3dedb11…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 07:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5dcd7f1fbc4ac28d6a21a0c669a2c33e SHA-1: 1dc9a4e70420a34197589780e59a5ddc067c91b4 SHA-256: 675a044fb3dedb112264795a6589893243060f9dfc76eeb17bde4d7df24a29bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs pointing to various domains, suggesting it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a coordinated effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://queure.ru/uplcv?utm_term=devil+wears+prada+putlockers PDF link annotation
    • http://drzwiukryte.pl/userfiles/file/25499982580.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/95550288851.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/1639106085.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/fizevenem.pdfIn PDF document text
    • http://favourtec.com/attachment/file/kuzuzobevezulukebopix.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/k5ikvh1ugbvr7quibtpd7pk3h4/21420818134.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/38049894500.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210908_220137.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/85460009224.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/nadukekidofatadevazonofex.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/97684087026.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/57638131322.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/nujapufagamoxu.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/vumuwiwapexamimakewifebak.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/jofinujaroxenerij.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/99763539219.pdfIn PDF document text
    • http://foxadv.net/file/juzedor.pdfIn PDF document text
    • http://exima.kr/userData/board/file/14462972388.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/18816241347.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/79748972637.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/vawujifabelapopofojexum.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/69285748593.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210902101840_f3kgac.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/mobafekutomila.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/65882851351.pdfIn PDF document text
    • http://exima.kr/userData/board/file/3956734669.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_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 16972 bytes
SHA-256: 9d660419b2aaae417bfcc3f00b1180e7aeb16dc5b54988d631f4b8114e9eb040
font_01_sfnt_off00010720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 10748 bytes
SHA-256: 8f099b6603fe32c57c236fc71bcf09124706fb6c48a5cf2dcdc7b79a931dc34b