Malicious PDF — malware analysis report

Static analysis result for SHA-256 2073533bdb50aa8b…

MALICIOUS

PDF

74.5 KB Created: 2021-03-25 06:06:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7045931942fcf534ee91ef2fc1af994 SHA-1: 2a118bee2a42c81b2099a2a8dfb53d565645ba19 SHA-256: 2073533bdb50aa8b51166ef6bbac3a7b178daf2c94c3afc87589e3e6a6c47d72
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to link farms on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external links and the heuristic firings point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://zajinet.ru/wix?keyword=battlestar+galactica+cast+season+2
    • http://ruregere.sportsontheweb.net/5th_generation_cephalosporin.pdf
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/tuzesaxewofotusor.pdf
    • http://sufofure.mywebcommunity.org/likoxoxawulaxefubosowipe.pdf
    • https://static.s123-cdn-static.com/uploads/4468837/normal_5fd08f60a47cf.pdf
    • https://cdn-cms.f-static.net/uploads/4493209/normal_6046af5e6075b.pdf
    • https://cdn-cms.f-static.net/uploads/4490263/normal_6050734bd691e.pdf
    • http://miribut.mywebcommunity.org/premiere_pro_cc_2020_keyboard_shortcuts_download.pdf
    • http://bilabugova.iblogger.org/asymptote_examples.pdf
    • https://kenibojowosude.weebly.com/uploads/1/3/5/3/135324683/mefepesajaguxukivug.pdf
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/e85b2e101470c5.pdf
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/1998782.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://faxiruvud.myartsonline.com/vitamix_5200_blender.pdf
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_e0834543971143ae90dabae51a8b3dae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f7e68a0e-7f57-4405-8c11-053ab8b09d0c/western_digital_my_cloud_mirror_gen_2_manual.pdf
    • https://uploads.strikinglycdn.com/files/be5960b1-7e67-44cc-990f-feff2186af7b/womens_air_force_1_pixel_white_black-sail.pdf
    • http://kinuzana.rf.gd/hep_b_vaccine_vis_sheet.pdf
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_3e695af7a8e6412d9903b25c8f0db687.pdf?index=true
    • https://uploads.strikinglycdn.com/files/16b72e50-d5fb-4615-aeed-9e4ae1cd20a3/healthrider_r65_treadmill_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_off0000e591.bin
5a4878e0aefe21859ae832313b18b4f7ba284bfec162d19cdb016155df8dbcc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE591 5148 bytes
font_01_sfnt_off0000f727.bin
f262abf608787656529d32297ad68d36c7b12430fdb83ad91a933928ecc50cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 11296 bytes

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