Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41ca2ba9f1007d7…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 03:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a114fc0a31a99701421f07126910a36 SHA-1: 51d217cd8c6b18f2db45ca4dc32b52ff8f07e97f SHA-256: b41ca2ba9f1007d7fc32cfb64e9646922b69f8cce329bdadf4a7cd7195aae263
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://andhimazhai.com/images/files/satojokazepuxogi.pdf In PDF document text
    • https://norservis.info/files/files/40958491128.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/51689730227.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/pinupexipefij.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/32517032731.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/lutatowa.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/xezulelemibawukaxupiwipe.pdfIn PDF document text
    • https://freeunlock.com/uploads/file/mavinuzevijavewigidom.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/5877400553.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/29027953697.pdfIn PDF document text
    • http://poultech.net/d/files/gawamo.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/84325404019.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/42403823563.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/32737071531.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/fesoxitumosumefejipatebe.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/74395913182.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/lijogelu.pdfIn PDF document text
    • https://iimranchi.ac.in/ckfinder/uploads/userfiles/files/lejag.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a10c2a1eae---pawamasixovabuxinowubali.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/54961876826.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/612f5badb2aed.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/95733197615.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/43130567991.pdfIn PDF document text
    • http://gaudi.tw/upload/files/88254807985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+mp3tube+new+versionPDF 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_off0000b41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC31 11120 bytes
SHA-256: feac856ff69b2a4dd594036bd65010a815a14db65a464b893a83c7637b1c17ab
font_02_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 16888 bytes
SHA-256: f099fc3c2f7f0e2c6608d8a24dd9322a2bfb6373d9955e96077045d6dab934a8