Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2e854945b2f13c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 20:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ec6b6f8df1333ee880bfe85169a8c77 SHA-1: e2592e91de4cda48c37415debf655a19192cad94 SHA-256: 7b2e854945b2f13cd81ecaba97a035920946dbf0249c82daed9b019e51907405
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and one heuristic specifically identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of PDF_URI and EMBEDDED_URL heuristics suggests an attempt to redirect users to external content, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://findusafranchise.com/files/files/velasowusajijolapalajus.pdf In PDF document text
    • http://ambulanceservice.pl/userfiles/file/gajizozube.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/potar.pdfIn PDF document text
    • http://ore-processing.ru/d/files/48302265681.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/79862334989.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/tunajetara.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/pesowof.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/93901470784.pdfIn PDF document text
    • https://ghnservizi.com/file/96825207235.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/20689839759.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/48663056293.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/67602850396.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/novoxuzamufejozo.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/84029636077.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/doxiweladegujusugi.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/rafug.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/72902822418.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/99f15fa0491a855ba409f4cd5c1e4312.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wipidalabubuvaverewono.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/nofoturagabewudiluziseni.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/25930583583.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/tevujab.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/20910814986.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zixuzosisosazerajom.pdfIn PDF document text
    • https://tele-video.ru/upload/files/23488994413.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/debelukigomulaku.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/sojugeniputenokutofewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+pocket+edition+demo+downloadPDF 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_off0000d3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 10784 bytes
SHA-256: 682adc7766c8265763296a81de014a2d1a422dea13085a4612a04f953c27ca6a
font_01_sfnt_off0000eca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 17380 bytes
SHA-256: 99d333d51cd08ac88d57bae868211cb5039d8eee51a6f3d3c206e8385cf07de4
font_02_sfnt_off0001197a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1