Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc3b4b8ca65f947…

MALICIOUS

PDF

81.9 KB Created: 2021-03-01 14:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4972ec8c90e1d59a4a52abfcbc91c48a SHA-1: b1f43c6273642b7eede0d372da6271b77260f99f SHA-256: acc3b4b8ca65f9471a25f9763f42b61a6e8699063bc358ffd4e4499be3859616
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to host a large number of links on disposable hosting, likely for phishing or malware distribution.

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://kuzutuzo.ru/wix?keyword=mcoc+act+5+guide PDF link annotation
    • http://dabobez.22web.org/wajit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405202/normal_5ff03cb3c4fce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5fd260bd4f2aa.pdfIn PDF document text
    • https://cdn.sqhk.co/xevezele/fjbigPc/44562998768.pdfIn PDF document text
    • https://buwigare.weebly.com/uploads/1/3/5/3/135308802/2836360.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/hdUggK8/exo_members_lay_left.pdfIn PDF document text
    • https://kitaterikobojim.weebly.com/uploads/1/3/0/9/130969176/bosegupadeguzixutap.pdfIn PDF document text
    • https://cdn.sqhk.co/fomiroza/ezjaibI/7377826209.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/wall_street_journal_subscribe_student.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/gtz3iau/snapping_turtle_animal_crossing_new_horizons_southern_hemisphere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_601299c2c8679.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_5ffa86b3d6b24.pdfIn PDF document text
    • http://sutiwejepeb.22web.org/nafetim.pdfIn PDF document text
    • https://zolowokixo.weebly.com/uploads/1/3/0/7/130738875/fukogafabom.pdfIn PDF document text
    • http://tudewulowas.iblogger.org/edital_auditor_fiscal_df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_6014e358b5467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/boney_m_daddy_cool_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/physics_equations_final_velocity.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/cgs_full_form_in_medical_billing.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/how_to_draw_inverse_function_graph.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_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 4928 bytes
SHA-256: 490038059cb02308337d5f2e268df7b5becb3ae81a9ca05f0e806624b5552b64
font_01_sfnt_off00011655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 10688 bytes
SHA-256: baba59ba935da62254fef27ded00a94b0f026ab144d9edfdf95a088c54ebb157

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