Malicious PDF — malware analysis report

Static analysis result for SHA-256 3847ac77623e1f4b…

MALICIOUS

PDF

75.5 KB Created: 2021-02-28 07:33:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 71682f56b7b9656d621519d8d1aeefe4 SHA-1: ffdcb48f7f1ede14156ced6fbe3954af67d5fad6 SHA-256: 3847ac77623e1f4bf81051ed387e925665ddaeeef6eedc36dc1418726b4d513a
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the 'link farm' heuristic suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious lure.

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://leonvi.ru/aws?utm_term=how+to+pronounce+pali PDF link annotation
    • http://afracheat5.xyz/dub_music_player_pro_apk_crackedtjtsh.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/psychoanalytic_theory_in_childrens_literature.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/paea_eor_family_medicine_study_guide.pdfIn PDF document text
    • http://sfr-webmail.com/zz_top_discography_torrentneazu.pdfIn PDF document text
    • http://cosmeteca.com/jugexusowarutefovakimobepc1wh7.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/redigukimewebulubilimas.pdfIn PDF document text
    • https://pufoxedoj.weebly.com/uploads/1/3/4/4/134438994/lutaratapadij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vipowiso.epizy.com/blown_away_imdb_parents_guide.pdfIn PDF document text
    • http://gotakedadonere.rf.gd/chemical_bonding_worksheet_chapter_6_review.pdfIn PDF document text
    • http://daroxupotebaliw.rf.gd/libertango_sheet_music_trumpet_solo.pdfIn PDF document text
    • http://tupemovon.rf.gd/sample_actor_resume_format.pdfIn PDF document text
    • http://ludumidajite.rf.gd/brave_soul_jumper_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/a_gentleman_full_movie_in_hd.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_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 4804 bytes
SHA-256: 00e35b848b87315d84c13b1c7c284f4ad5c4415122989724ee93f060e7df4fba
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 12376 bytes
SHA-256: b8494636f39fc379f50820a3beef001cd856a83e714627445637065ac9d48306

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