Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdef4e4f386bf02…

MALICIOUS

PDF

86.1 KB Created: 2021-03-09 08:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4844de3c968a23eb723a177f408df53 SHA-1: daac5f806bd030e19c5693eccb0a02248b8b595c SHA-256: 2cdef4e4f386bf02927297be2827871702a14fc7dd561c39053eace0b827ca89
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/award?keyword=ncert+chemistry+book+class+12+part+2+pdf+solutions
    • http://zivemigidefis.mypressonline.com/annamacharya_keerthana_lyrics_in_telugu.pdf
    • https://static.s123-cdn-static.com/uploads/4409818/normal_5ffa8d824bd88.pdf
    • https://static.s123-cdn-static.com/uploads/4421038/normal_5ff8abce7e9e2.pdf
    • http://kumisaruvejinud.iblogger.org/summary_of_chapter_2_in_call_of_the_wild.pdf
    • http://dusejetiwogodad.getenjoyment.net/penny_stocks_to_watch_motley_fool.pdf
    • http://ziponep.22web.org/71799014706.pdf
    • https://static.s123-cdn-static.com/uploads/4486522/normal_5fe0e1e62a25d.pdf
    • https://cdn-cms.f-static.net/uploads/4450151/normal_603d75dc0d38f.pdf
    • http://kepamusujuboza.iblogger.org/systems_analyst_technical_interview_questions_and_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4404500/normal_60435091eb28c.pdf
    • http://logawedulukudan.mywebcommunity.org/kibixitezolif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a901ed55-f14f-4d8a-ba54-7b3add2ad692/a_christmas_story_live_cast_2019.pdf
    • https://uploads.strikinglycdn.com/files/09b68385-9f5a-4a71-ad11-1b4a3049ada0/kezid.pdf
    • https://s3.amazonaws.com/lejivugeleguwod/10493345624.pdf
    • http://vuvuvemalazot.epizy.com/behringer_xenyx_1204usb_review.pdf
    • https://uploads.strikinglycdn.com/files/f1b8d72d-1f5b-4abb-8533-a516ddd24800/16401854202.pdf
    • http://vakizonozajaxe.onlinewebshop.net/star_wars_jedi_fallen_order_review_embargo_date.pdf
    • https://s3.amazonaws.com/fezenur/frases_de_el_arte_de_amarte_por_nappa.pdf
    • http://vifufabujeso.epizy.com/relaxing_music_deep_sleep_free.pdf
    • http://tuvugerij.rf.gd/access_control_in_information_security_ppt.pdf
    • https://uploads.strikinglycdn.com/files/a1762f2e-3673-4c11-96ca-a436e3fbb8e3/bissell_proheat_2x_revolution_deluxe_carpet_washer_review.pdf
    • 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_off00011264.bin
4cc49118149796b027799010f985d1dda329724c70adbfe4eba0bd03fa502639		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 5852 bytes
font_01_sfnt_off00012634.bin
525d14dee3884075ab37d5f16480b4559caa19e5bfc7b06f6ac750f776e384ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 10812 bytes

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