Malicious PDF — malware analysis report

Static analysis result for SHA-256 f403ab65ab69a48b…

MALICIOUS

PDF

99.4 KB Created: 2021-10-06 10:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c41774fefa4a8b0aa467bf99203bf32a SHA-1: bf1b213e522d1016cb43ffe65f15cef99a9a7e86 SHA-256: f403ab65ab69a48b30e3be9321e137ad2892c586a4633a1383d2cc1afd49ce9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://zartmobilia.com/userfiles/file/20210925035631.pdf In PDF document text
    • http://clairvoyantinfotech.com/demo/images/37852409115.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/tenajagokol.pdfIn PDF document text
    • https://grandegroup.net/files/nirozumurabimofagagabaw.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/99421388804.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c310caff6e---58329720720.pdfIn PDF document text
    • http://vhshf.de/File/tivawas.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/vuvixinesuso.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/74102262091.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/94956533059.pdfIn PDF document text
    • http://myslizdrave.com/soubory/lotoromuke.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/70539640965.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/sofatevazafuko.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/29978701701.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/66245522810.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/sujulegosikoka.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/93080370964.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/pegofimudavogedapituf.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/pebuxunakusixu.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/51223310220.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/3038539281.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/lukiwen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=love+failure+song+download+naa+songsPDF 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_off00011b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B95 10640 bytes
SHA-256: b75b03aca8b27021ddf420e8abec3b5b77831897c73cb1095f40d4677761f8b0
font_01_sfnt_off000133dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEF 20440 bytes
SHA-256: 05e7952bacd2625713f14366e8dd4ecf4dded9a1673819efce3f17b6d3e23574

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