Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76075aee0e0847b…

MALICIOUS

PDF

72.8 KB Created: 2021-06-09 23:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 64f0aea36ef39d8791c3e107b30f390b SHA-1: 5470121af159b2cfc2d7cb3e8a8160e2bb5298a7 SHA-256: f76075aee0e0847b23462fdb6fb59f532ad24da4dc87dee63c685b4ddacb9a3b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm that appears to be a lure for malicious activity. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect the user to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/pbw?utm_term=vishnu+sahasranamam+baby+girl+names PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450042/normal_5fdf9fd0501a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_6018e7c8ba92e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_602766f70ce28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390095/normal_60502ac383cda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480173/normal_600fb23a144a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450730/normal_5ff2ac6a0ec08.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5667203-35d7-49f1-9f83-612e35735a5e/sig_sauer_p238_review_hickok45.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144440475/how_do_doctors_check_for_astigmatism.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144416283/gudulafese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d176f468-6143-4d1a-ac70-179f57321d6e/80375347969.pdfIn PDF document text
    • http://refarumiba.pbworks.com/w/file/fetch/144600528/98740163984.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413322/cambridge_first_certificate_in_english_3_with_answers.pdfIn PDF document text
    • http://naxenuve.pbworks.com/w/file/fetch/144470061/75938001466.pdfIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144747291/queens_code_summary.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/f/22162260189.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/f/how_to_find_the_least_count_of_a_vernier_caliper.pdfIn PDF document text
    • http://polubisoxuwo.pbworks.com/w/file/fetch/144495801/how_many_types_of_cctv_are_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f5b172-ccb7-419b-a02f-510fec397226/gutubajakolu.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144647508/warriors_cats_firestar_and_sandstorm.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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 5304 bytes
SHA-256: 4a2c3d4c68811c21a3e33bda1b183dc72e0336b84424bf911c4e54afa69e34e1
font_01_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 10628 bytes
SHA-256: 6371a3ee2f4e3420206e65405810e65983a195782da07fbf7e7543e21615b954

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