Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd325b2bfc096bb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 11:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4055125510c47935ba44c02056fd4030 SHA-1: dfad5b62c782518ad02c1c881480c60f28268034 SHA-256: 2fd325b2bfc096bb8a021cc4d46a10d6a42f6f697fc71eca4caf31617ee6e828
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be link farms or disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm nature of the document indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=phone+settings+apk+download PDF link annotation
    • http://mhinflatable.com/upload/file/norokusizi.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/kizawokuxanajiri.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/4874276098.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/xamunuzomapide.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/vezosunilanelegowiziwa.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/pitesokobut.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kalegemivoribavin.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140f286738b3---87887567873.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/xazaruvarevupoxudame.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/77447824312.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/naxadirububaxarexupum.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630822849867aaeec609a4260c6fe.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/zoketudufiko.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142bd96709ff---5265057853.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/74580788222.pdfIn PDF document text
    • https://alev.az/userfiles/file/11016341663.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/39080865717.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/toweli.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/vujuwedolonatowopuput.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210908121333_zz8dcm.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219419521.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_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 17900 bytes
SHA-256: 25e0872fde0539239ea218e9836b812e9591ab459e9ed01cf9994fc862317420
font_01_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 10748 bytes
SHA-256: f7790079248ab61607069d46cf2c2888f7154f168e0cfbeb899fe25d117f0eb9
font_02_sfnt_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1