Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb7aad724249154…

MALICIOUS

PDF

101.4 KB Created: 2021-04-16 00:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 883607b325c8e53a5824891403eba7c2 SHA-1: edaeed209640f849da0b0d05a165ab26729851cb SHA-256: 8cb7aad724249154bf7ad2747f63ddc9be4756100b907e6bba6d1b8e5322cd0b
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' and disguised as a tutorial. The PDF's structure and embedded links suggest it's designed to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=propresenter+7+tutorial+for+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477863/normal_603ac4ac0899b.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/cgegc7E/pirate_radio_movie_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/makekajet/iS00Yhf/51171662403.pdfIn PDF document text
    • https://cdn.sqhk.co/litametun/5ZhaJhh/adsorption_lecture_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/hgjagjX/tikabekomaxidosaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471081/normal_6028838b7d338.pdfIn PDF document text
    • http://mazezoda.22web.org/kumon_math_level_g_answer_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_600ea79458250.pdfIn PDF document text
    • http://lavorunolutoga.22web.org/snake_pass_pc_game_free.pdfIn PDF document text
    • http://govorudoxamelap.22web.org/52474293436.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/ijiajiI/rekobegomabolex.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/g1XNIgj/samurai_story_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/webegodebav/f41jegj/82682651944.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fcf3979cad96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380383/normal_606cbc065e1a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokaluwog.rf.gd/rinizufudaluradizapo.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/lexawogimotodozagema.pdfIn PDF document text
    • http://zuleturibalege.rf.gd/circuit_diagram_of_full_adder.pdfIn PDF document text
    • http://mesipupip.rf.gd/tesoguxibifitukavuw.pdfIn PDF document text
    • http://tovujopojat.epizy.com/android_10_beta_note_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/the_pocket_guide_to_tcp_ip_sockets.pdfIn PDF document text
    • http://janalusexisowa.epizy.com/busy_busy_song_ming._co._com.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_off00014b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8C 5288 bytes
SHA-256: e6ebd1a908c4884793364f0d17def23d8dc7a47086f579ecdbc22a2a0398e31e
font_01_sfnt_off00015d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9D 12068 bytes
SHA-256: d2485bd7ae218c378aaca039878fbcb18961071af38eefcf98128fc3a504ad6d

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