Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d8d1043e5ccf2c…

MALICIOUS

PDF

94.1 KB Created: 2021-09-13 19:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 454272c25bdb1f49a0a81cced67d4997 SHA-1: 2e7a4ee229aeab6b957b730a4fb4b54f54ea37a5 SHA-256: c2d8d1043e5ccf2ce723c1e4efee7279c6df2ec6d6738b00f3b6a3ca1398e71e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the PDF and its embedded links strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tribo.kz/userfiles/File/kuxasojexozetezejolixe.pdf In PDF document text
    • http://crescentcarpets.com/userfiles/file/titode.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/garetefidagi.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/jereviduda.pdfIn PDF document text
    • http://koala-al.com/d/files/73475447576.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/82990668458.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/fudiwolafixasebam.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/totinelemiva.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/vifuvelije.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/75143757732.pdfIn PDF document text
    • http://vodnik48.ru/content/file/xafubovamakilejurotudekid.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/80103756200.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/50259921305.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/36443844914.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/42349731893.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/sarubizinafubavezifa.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/18112507309.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/82513920539.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/makemonogetuwujonozilofod.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109051311345442.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/43604612531.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/91969861837.pdfIn PDF document text
    • https://reha.bg/content/upload/file/91886932343.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/rimujesun.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/6611160133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=http+www+readwritethink+org+files+resources+interactives+timeline_2PDF 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_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 11552 bytes
SHA-256: ac23dd64edfeb3caf1fea30b0448acb157d94bfe9db6166a502577baa54d24ac
font_01_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 18784 bytes
SHA-256: b4b9c101f5cf07d887228c7f42d90a1731dbd6e387a83534e48de90fbb20a518
font_02_sfnt_off000151dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1