Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0247973967183f9…

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 15:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e668e2d475a9a99221b26cfd06e05e28 SHA-1: d338145fbdb3b0f8cf0626cc4a9844240377abf3 SHA-256: c0247973967183f908da63e5961bcff1dc16746bf43c49a42976dae4405ea55f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF viewers or redirecting users. The presence of numerous external URIs, many pointing to potentially disposable domains and configured as link farms, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cukrarska-vyroba.cz/UserFiles/File/puvifoforewaxuvibole.pdf In PDF document text
    • http://kawana.tech/userfiles/file/17948099598.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///40763191680.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/givexokavabuba.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52256265397.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/85698831653.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/92224656017.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/jaraxupewe.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/vumonizi.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/diloviwabef.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109012326122554.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/zejuzudelipe.pdfIn PDF document text
    • http://leeandrewdavison.com/download/xikubo.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/64616399759.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/54673156524.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/38217627515.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/wopiwofakojawogatemoxo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c68f1b3005e1b126464bf318e6c52eb5/60109813886.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/lofun.pdfIn PDF document text
    • http://hodori247.com/uploads/files/10135341304.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/50611046047.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/i8g341dju5fi5cejao9j9m9f10/rovegilefidebabalelip.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/6287103644.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/24783574606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=simple+browser+apkPDF 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_off0000c14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14F 18208 bytes
SHA-256: 8eac66a4ce7d90d58c2b40bc069a95991065c3b0b0eeba93a7b48d77d6a847bf
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 10604 bytes
SHA-256: 5818dd106030636fd687a3090f9cbfbf5c444e7a7be01e86475d72aa86ed87f0
font_02_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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