Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49ee3a2fd204e9b…

MALICIOUS

PDF

75.3 KB Created: 2021-04-29 07:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8de9a609f0c9c259a769f07a19fe761b SHA-1: 5806a0d7b50627561ef1106ba326e999e13fa944 SHA-256: e49ee3a2fd204e9bdd0d87ebb85b828daba0fdb8d328877ec7538e02dff56db3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=how+many+computers+can+i+install+serato+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5fe6c4529028b.pdfIn PDF document text
    • http://gitilapen.66ghz.com/a_wrinkle_in_time_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412593/normal_5ffcf5c098211.pdfIn PDF document text
    • https://korisupugi.weebly.com/uploads/1/3/5/3/135308649/6068882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_604de324a57e7.pdfIn PDF document text
    • http://rudirunudug.iblogger.org/how_do_i_program_my_comcast_remote_to_control_tv_volume.pdfIn PDF document text
    • http://rixokufofaru.iblogger.org/b_d_chaurasia_anatomy_volume_3.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/xadefepogitet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_602f745d14dbf.pdfIn PDF document text
    • http://divalurumewib.iblogger.org/cerebral_arteriovenous_malformation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406216/normal_602b9c02c6e63.pdfIn PDF document text
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/xuwelemewisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fewaxujuwede.rf.gd/51226721296.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/multiplying_exponential_expressions_worksheet.pdfIn PDF document text
    • http://nisepekana.rf.gd/atfl_sprain_exercises.pdfIn PDF document text
    • http://jarifixe.epizy.com/electronically_stored_information_order.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/penomelesaxesudiwiretovik.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/avengers_endgame_4k_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/breaking_bad_episode_2_parents_guide.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_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 5232 bytes
SHA-256: 8e3ee549a5aa97a40d9cb17a1f0647ef1bfd38ae63fca91bc04f550264c7c100
font_01_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 10544 bytes
SHA-256: 8351eadab906a1e0fbae5b610e87f92eb4c3aed8b1356b8253c10d83aac274a0

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