Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca29b7843e7ebe1e…

MALICIOUS

PDF

98.9 KB Created: 2021-09-11 22:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03e0753e987fc0c1fcffe662bbce4033 SHA-1: c4352b6ff365cc1d958aa7f0255993195aa8e30c SHA-256: ca29b7843e7ebe1e68ce9c690004ef169263cbbbc8a6c01d37044b4e3408cf4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the high number of distinct hosts point towards an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=pro+evolution+soccer+2+ps1+rom PDF link annotation
    • http://mdsalon.ru/img/lib/file/75522927418.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/57778015529.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210908_6405442D87FB83DB.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/92274362647.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905180503.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/33930108579.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/4707276417.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/97916744803.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/29879314722.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/juzejukop.pdfIn PDF document text
    • http://nscenter.cn/upload/files/wajemubelebovoxaramoloz.pdfIn PDF document text
    • http://vkts.se/userfiles/file/wevug.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/69231117966.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/vikemubitafarutapu.pdfIn PDF document text
    • http://ore-processing.ru/d/files/82832179124.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc0c70e4c4---susatopizisubiroja.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb6442408---wogedubifebanolunagozol.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/xirijaforodovunokodoviw.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/75472018705.pdfIn PDF document text
    • http://gro-felix.si/uploads/54537508232.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_off00011492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11492 10712 bytes
SHA-256: 0c6481c59cc459ed0f73cd4ca76e98675bc00e273b33d8fce521097063605a92
font_01_sfnt_off00012d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D44 21240 bytes
SHA-256: dbc1e7ef669ed239daba2587d26f8f5410708062363c945f67fb0609214dd223
font_02_sfnt_off000165f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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