Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e14a81112b3a461…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 11:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 067643bc2b56f5723e71342bc8bc5b76 SHA-1: 132aa792c6602d2b567684b2e61c02642df21950 SHA-256: 5e14a81112b3a461b4f5c81e8e12ac53a157e3ce97cea41820a2264eb5f34dcd
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to potentially malicious or disposable domains. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://e-sheremet.com/img/2010707477.pdf In PDF document text
    • http://5thaveseniors.org/userfiles/file/5848558315.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109030757349124.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/fimekekefitili.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/gowapuzujawenolof.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/niranane.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/15432803972.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161392b053c73d---fuwalamedamifowe.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/48400939055.pdfIn PDF document text
    • http://benly-carson.com/product/files/tezatovop.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/kitiworobezomup.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/wunavub.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5600a9e6728e9610b840802f7a5baed2/rusuxawodekito.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/vimalomewadasusezabag.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/16732472703.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/sazarajubudubivogis.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/katalodese.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/34297254191.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/toporema.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/2717062445.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/kigigigaliwafoto.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/77283149035.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/90342388042.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/wiguz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=share+live+location+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/91964798098.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_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 17604 bytes
SHA-256: 3094215e85c7c79743640e04dd15c7cc354c2d6da982d8f5559edaaee6090ba9
font_01_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 10440 bytes
SHA-256: e7691de24a712b4402c5bac1510e8e1ee9b9cb1acbc36d2736434bd1d41c0774
font_02_sfnt_off00011d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1