Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2bcdfe8236da52…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 23:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2db4a49095120c41332efa017f09456f SHA-1: 1926dac7f4b6963dd9645db8977ef60f5314e471 SHA-256: ca2bcdfe8236da5253b86eaeaf9efc45c896d67e547cf81dcbb41eaf8187e1d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=cut+audio+apk PDF link annotation
    • http://dubilex.com/userfiles/files/pomot.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/gigaxemogowi.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/83837523876.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210908_2526C94A087A7516.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/1403035460.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/vajipovapavimasevexazato.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210903004742490.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210906_CEEB3A8A7AE3E134.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/mipigizositakojopofa.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/75987084074.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/545a575c8c58cee49f2ed4bc0b620a76/gifotixaromutanurebe.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/tevisotij.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbcb043bb5---jaropo.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/83430234924.pdfIn PDF document text
    • http://anitacalderon.com/ckfinder/userfiles/files/4183379585.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/81970514578.pdfIn PDF document text
    • http://gioithieu.btccorp.vn/uploads/files/79201118988.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/mosisatusevezimiw.pdfIn PDF document text
    • http://podushka.by/files/files/ragudiju.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/15234182297.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/labefa.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/89799579015.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/57091418172.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/gorotova.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/95634660517.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_off0000b2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE8 10056 bytes
SHA-256: fecd2064c19f74236a307f2c05621a0ccfe2fe4984878d40b36411abb19a92db
font_02_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 17584 bytes
SHA-256: ac7642ab11898107666ef2ef402159c5eff432161669a9bbe782e1cc81cd854f

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