Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f0568a0883d8c1…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 12:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f9dcf4b381751949a8142e2c6bb5b6d SHA-1: 039969ed4a4eb1dba62e5627decb6e203dab55b0 SHA-256: 16f0568a0883d8c188e2fd2798cc60ea6049ba71ffe37906d9cdc617a95a746e
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. This suggests the primary purpose is to redirect users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://519pf.com/userfiles/files/48196200846.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c25e85bff---museniwi.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/nadedofigo.pdfIn PDF document text
    • http://erex.hu/upload/file/36218149503.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/vumixesopufirugejedi.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/zaluvamabagiwelijo.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/25286718341.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/88301769103.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/faxivos.pdfIn PDF document text
    • http://liyangah.com/Upload/file/5952484178.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/kuwaredomajofulivifire.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/zagezekugadigofuwuxod.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/jezafoxatatifumaf.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/63390510723.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/nukivosaberesodedisa.pdfIn PDF document text
    • http://hmed.vn/upload/files/tomagume.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/81155550945.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210908035159.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/91474511024.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/jewerevofa.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613002d626b8f---95299034369.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/zaxupakuvilup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=power+notes+pdf+biologyPDF 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_off0000be1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1F 16992 bytes
SHA-256: 526e30f52fe2b857871b05bdc14485572e0700d3ff55ed2cf534ccee0b8a3b36
font_01_sfnt_off0000e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 10852 bytes
SHA-256: a22bf1fe086e8139366464a52388b02ab51ef2f4b4c0c92a4310710e3bf826d0

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