Malicious PDF — malware analysis report

Static analysis result for SHA-256 01727efd35819ae2…

MALICIOUS

PDF

67.2 KB Created: 2021-10-03 08:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5bf3cba14cacabea5b59823d66eb2910 SHA-1: 71920d23b34287e861896caa9a8b392df95f0e0b SHA-256: 01727efd35819ae2a0226afc71f76f121d357e1d842a9f01e32422a948dd0b64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically identified it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=broody+hen+definition PDF link annotation
    • http://losangeles.songhakbbq.com/uploads/files/60966236602.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/91536426383.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/womepaguvi.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/sonowazo.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/xaboxef.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/pajagexiposukanajar.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/61190449571.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/47961756336.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/jesama.pdfIn PDF document text
    • http://adveotec.com/img/file/59601202445.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/37504ea73b9a158d3ef320064f80872b/65660078700.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/71313184717.pdfIn PDF document text
    • http://lukinserv.hu/file/33104824090.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/9712864845.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///54211723080.pdfIn PDF document text
    • https://nada70.org/userfiles/file/rapedukelitatugopobefe.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/rikudegu.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/26978116981.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/66281059312.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/5255725268.pdfIn PDF document text
    • 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_off0000a9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9EC 10240 bytes
SHA-256: b9c2c78aa2b85733b5ffeb7093872da49eb7635614c8da8b6ddd290261d5a226
font_01_sfnt_off0000c0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 15296 bytes
SHA-256: 895463145ecf7e3dea18dabe22a31e3134aab9b138254e492b1b41e19a1c8ea5

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