Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26e5600d3eb0881…

MALICIOUS

PDF

137.9 KB Created: 2021-03-02 21:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f377576809669c35f74c4fb7cea9b906 SHA-1: 21d5f84cac11cf5334ebd8294297534d275e8a62 SHA-256: e26e5600d3eb0881cdb020d05774d4546a96b97161ba89d78ea6fd47ee111f79
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('ponafet.ru' and 'mywebcommunity.org') that are likely used to host phishing content or distribute further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=pays+basque+francais+et+espagnol+carte PDF link annotation
    • http://fukiwurezopukof.mywebcommunity.org/draw_straight_line_graph_online.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/4df440e36909.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/delonghi_pac_a120el.pdfIn PDF document text
    • http://teniran.22web.org/canterbury_tales_coghill_translation.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/gnostic_christian_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_6010fc88ddcdd.pdfIn PDF document text
    • http://sibewurenevedig.iblogger.org/vatuguzewowajav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dezologukow.rf.gd/short_and_long_term_career_goals_answers.pdfIn PDF document text
    • http://kitilogokufalu.atwebpages.com/67577436928.pdfIn PDF document text
    • http://pujumek.myartsonline.com/endocrine_system_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/80289319067.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/backup_and_restore_apk_oppo.pdfIn PDF document text
    • http://xisebekixow.epizy.com/how_do_i_reset_my_samsung_galaxy_s8_phone_to_factory_settings.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAC8 5552 bytes
SHA-256: 3385215db384fe3dad6242157344d78e3f74f1f9e2c2d33badcc83046cad4cf6
font_01_sfnt_off0001edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDC4 14028 bytes
SHA-256: e7ea9918c126fc1743fc690df842f6b09a051659c4497812ffd2b309a18558cc

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