Malicious PDF — malware analysis report

Static analysis result for SHA-256 952a7730c559a8f4…

MALICIOUS

PDF

74.6 KB Created: 2021-03-21 02:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6553d4c6c99ee0f342ef789f7d03f31 SHA-1: bacb81a5852fdf171111f8288101669a09aee836 SHA-256: 952a7730c559a8f47ab056918328d1d2e55c2fe1f7efc7e0eecf3d158ff93b18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/award?keyword=sports+cups+and+trophies+list+pdf+download
    • http://vufajed.getenjoyment.net/ballard_high_school_sports_schedule.pdf
    • https://pifisurap.weebly.com/uploads/1/3/4/1/134108900/vonajetewo.pdf
    • https://paruvinuj.weebly.com/uploads/1/3/5/9/135970142/fd585.pdf
    • http://kikababono.mywebcommunity.org/best_guitar_theory_books_for_beginners.pdf
    • https://lalupapetawosi.weebly.com/uploads/1/3/2/8/132816164/456820.pdf
    • http://rimujitibux.mypressonline.com/cours_bijection_injection_surjection.pdf
    • https://vaxofawaz.weebly.com/uploads/1/3/2/6/132682661/momatulolevidanen.pdf
    • http://sizuxofutitarax.mypressonline.com/cancer_stem_cells_book.pdf
    • http://vamefegali.mywebcommunity.org/gopavazobazubenow.pdf
    • http://janafan.scienceontheweb.net/12685721977.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0e11b281-d85a-40f9-9b3d-3da4c5521c68/samsung_bd-e5300_unlock_region_code.pdf
    • http://galukovo.epizy.com/hp_scanjet_4500_fn1_driver_download.pdf
    • https://uploads.strikinglycdn.com/files/dd21a05b-2704-4710-bb23-58f211fcc027/julius_caesar_act_4_test_answers.pdf
    • http://kugexuluke.epizy.com/36411898636.pdf
    • https://uploads.strikinglycdn.com/files/5f012482-66ae-43d3-85b3-fd176f11c9f5/94598001447.pdf
    • http://zogosugo.onlinewebshop.net/common_core_sheets_fractions_as_division.pdf
    • https://uploads.strikinglycdn.com/files/3dfa6d9e-6d92-4546-ac27-de1fb3f7a379/rasutarufe.pdf
    • https://uploads.strikinglycdn.com/files/d4cf93bc-392e-4fc9-a255-8a30ca3bcb8c/sojafokizepaxofunezo.pdf
    • https://uploads.strikinglycdn.com/files/71b821e5-6937-45f1-99c3-49e97ab87e80/91290929690.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_off0000e574.bin
280ceeb003393162519b2ed8698e02271b6e61ecb55f181295f7220b05937426		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 5440 bytes
font_01_sfnt_off0000f7fe.bin
740e55f155c10d4bcdb845a1920878fe98e3ad6b2698ff1e50f38b49f7a4ee10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 10868 bytes

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