Malicious PDF — malware analysis report

Static analysis result for SHA-256 3308b79b81031b41…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 15:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5de4c7ebe004088d162da67032e9d740 SHA-1: 287a928c7a6586ecb84d3ff35de3ad201a7fdb6a SHA-256: 3308b79b81031b41ceff46b63ad289da7515334b5e4ce81bad65e585f05f7aa4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a tactic to distribute or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7970

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://4998horo.gmmwireless.com/contents/files/kiralirunexopaferav.pdf In PDF document text
    • http://hondatayho.top/img-ngocbao/files/dunubuvijedav.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/32753833790.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/66894175211.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326aaeb324c---zaluwemukipibuniwamezagof.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/68635767566.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/2152974949.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109110400239886.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/53326853298.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/butiporob.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/divufodekejobisujuzojaxav.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/jopameli.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/fawogufuleferamus.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/48131637690.pdfIn PDF document text
    • http://bresky.cz/res/file/85561250956.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/26958282026.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/48637524136.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/54318854035.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/xowitenejigo.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/1059575267.pdfIn PDF document text
    • http://saaretravel.ee/images/file/36452255110.pdfIn PDF document text
    • http://semanbio.com/upload/files/25110452582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hanuman+chalisa+marathi+pdf+free+downloadPDF link annotation
    • 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_off0000d0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 21652 bytes
SHA-256: a1f4b0865493844ea845008c59adb33c99eda8bf51d248889ddf89a2bcd73669
font_01_sfnt_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 11064 bytes
SHA-256: 35eb8a55c67e3dfd1b6fa490c9b0b797bba21027517c4987a75de8cfea42a090

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