Malicious PDF — malware analysis report

Static analysis result for SHA-256 926717600699651a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 12:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b837f980dd7b2e6f44efcf59a0917f76 SHA-1: 56ee48b2008930217b0abc64e3c6ba98fb00fa33 SHA-256: 926717600699651ac0334570af2fcc46e7317bffb36e2fa6039091d54f7bd209
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The PDF structure and the presence of multiple external URIs, combined with the 'disposable link farm' heuristic, strongly suggest this PDF is used as a lure, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cuatudongsaigon.vn/uploads/files/pafeji.pdf In PDF document text
    • http://i-daa-wl.de/userfiles/79520317672.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/78378492334.pdfIn PDF document text
    • http://airfa.it/userfiles/file/wiguletapizomolivuzem.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/24637820726.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/lafobogofexejefovizu.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/18645646498.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/vapumasogivilozawodaxe.pdfIn PDF document text
    • http://mamitobe.ru/files/file/49404104139.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/dovedekizoponup.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/67008084193.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/fizifuvuvujedapubolaza.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/14894726903.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4add67fd---12273981066.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/tolojoluzotim.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/55880876161.pdfIn PDF document text
    • http://aven.su/userfiles/file/sefijuduvoxizuvokubule.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/noranak.pdfIn PDF document text
    • https://nasikampung.info/contents//files/sojonemusiwuvenajawujepu.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/mafasaxupobezuxa.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/40736814699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=convertir+pdf+a+jpg+gratis+descargarPDF 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_off0000d083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD083 10976 bytes
SHA-256: 736533db2fdd35f27234434f74c15c108e671b0b4d79a2f6ec467dc250adc130
font_01_sfnt_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 19484 bytes
SHA-256: a337674ad192f327fc395dd0770d60cd548d153c1f3494673aaf696f0b5cef3d
font_02_sfnt_off00011be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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