Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d1d4431b1a3dc0…

MALICIOUS

PDF

91.9 KB Created: 2021-03-10 20:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41f0b41bf5f38fa2a288f9619ef34165 SHA-1: 315cb9abe9d4545f72aeea12d3ba21ac769e7ff0 SHA-256: e1d1d4431b1a3dc08eef508597a07b6789b0c90b9f9de6672cf7fd076ab69a6f
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URLs, with a specific focus on disposable hosting and SEO manipulation. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/123?utm_term=theta+binaural+beats
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/8741385c480268.pdf
    • https://tovujitirufozi.weebly.com/uploads/1/3/4/8/134853008/c8d819aa79b8ea.pdf
    • https://cdn.sqhk.co/jibezilesu/ghjbhbr/ganewofifowalewuw.pdf
    • https://mamijaba.weebly.com/uploads/1/3/4/6/134634293/xibekonoren.pdf
    • https://cdn.sqhk.co/bagadogod/gje4jgW/next_raid_boss_after_heatran_2020.pdf
    • http://xotizel.iblogger.org/4_pics_1_word_level_2268_answer.pdf
    • https://peliwotamo.weebly.com/uploads/1/3/5/3/135325711/nudebe.pdf
    • https://cdn.sqhk.co/lajoroteb/ijagiRx/33379805914.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/runuzitexokol/autocad_2013_activation_code_generator.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/nuvomidoxeva.pdf
    • http://jajowisomipuw.epizy.com/free_branch_manager_resume.pdf
    • http://babevuzax.epizy.com/hp_z420_user_manual.pdf
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_faa541b23fb44d1d9eadf83c435462c0.pdf?index=true
    • https://s3.amazonaws.com/juvetaso/44966397571.pdf
    • http://guwajip.epizy.com/54269452617.pdf
    • http://junedujivoxoz.epizy.com/vezuwiroliramosozamika.pdf
    • http://rejazimuperolik.rf.gd/new_bollywood_song_whatsapp_status.pdf
    • http://sugoxusegisefiz.rf.gd/how_to_make_a_mind_map_for_studying.pdf
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_c0487d953db34acebe5ef58c895a5b59.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012baa.bin
40f5cff93e8afb0ffc0d9e55a1bae12050683bd16bc8d6c8a48e98d15774cf4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 4864 bytes
font_01_sfnt_off00013c25.bin
1a58a691b0439a4072d49ffdb47e72c6701cda71edce752fb40f109a958ee3f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C25 11228 bytes

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