Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e38e7d04bf2042…

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 15:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b02eb4c5e653ba8fa06e5e1b76bdf0e SHA-1: 80ea0ecec2559ddb77e53d4aa1302c222cde39e4 SHA-256: 80e38e7d04bf20420045831a50f6c6baae9cc095eaa16802940de537fc38aa5b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to redirect users. One URL, http://frezerovka.by/images/fxeditor/file/liket.pdf, is particularly suspicious as it appears to be a direct link to another PDF, potentially a payload or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://frezerovka.by/images/fxeditor/file/liket.pdf In PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/5443851501.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/42200410335.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/gugexevosow.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/97673456806.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/40653110103.pdfIn PDF document text
    • http://btfa.tw/upload/files/fabujijewegobazerini.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/18359523110.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090807112873499.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/69456483114.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1c9ea23dc---bexuwiforaneforifirak.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/8779252024.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/retoxamusosegetanagut.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/suwami.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/62591320742.pdfIn PDF document text
    • http://didula.ru/img/file/6057853303.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/18168479946.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/nuvibi.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/vomasonome.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/miwavuvexafezojajuget.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/2930482361.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/mupuzupojodutat.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/63787356643.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/25851911499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=facetune+selfie+androidPDF 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_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 17936 bytes
SHA-256: 208d2cbc22947290d1ba91717a6a585568377fed9335de04465a7d8609e4e52b
font_01_sfnt_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 10548 bytes
SHA-256: 3f1c5ddcbb9d86fdae66f24b06cde3a7068d6a21fefb63d5b51f24b88d2aeddf
font_02_sfnt_off000133ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1