Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28896bfba4aa7eb…

MALICIOUS

PDF

108.5 KB Created: 2021-05-12 16:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 31a729c0fa843b8ea5f09055c0515bb0 SHA-1: 79149e7abaad884efd187c125abc587ad06222e0 SHA-256: a28896bfba4aa7eb2560918271b8607a92aca997f32182592fed2de9b9338b56
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to pallet truck inspections, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=how+often+should+pallet+trucks+be+inspected PDF link annotation
    • https://cdn.sqhk.co/rajexizeba/g8EL5jh/gewofidorusujojirupaper.pdfIn PDF document text
    • https://cdn.sqhk.co/zesokepewami/fQQsibp/99090241866.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/iidkKA6/ruwedekogugeparuwozobur.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/eMJhaYV/56753237252.pdfIn PDF document text
    • http://tawilexupo.iblogger.org/dubisi.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/K5sijje/vefenuno.pdfIn PDF document text
    • https://cdn.sqhk.co/zajikeze/VLSjez2/36468362561.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/hchcm4q/radio_flyer_horse_instructions.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/xokebore/sewing_for_beginners_patterns.pdfIn PDF document text
    • http://bageradafasuk.rf.gd/what_ammo_for_taurus_g2c.pdfIn PDF document text
    • http://sebilazog.rf.gd/38477268181.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/arduino_uno_software_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1615ecfe-3b6e-4077-973b-49d7a8f2a490/i_want_more_than_anything_meaning_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0541bdd-34cb-4023-8d94-54b5560f703d/tularolupidudejizugonovex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2036feb-3099-4b37-bee4-58397d46c5cd/what_is_lack_of_a_quorum.pdfIn PDF document text
    • http://kusogit.rf.gd/organic_compounds_containing_nitrogen_class_12_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/nowexepexibaf.pdfIn PDF document text
    • http://tivusanezidiv.rf.gd/xisuluwirenibe.pdfIn PDF document text
    • http://didajuna.rf.gd/bd_facs_aria_iii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861622f6-f691-467d-b4c9-fcdff97f3592/how_to_follow_walking_directions_on_google_maps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e500a6-428c-4cae-bb1d-12eac8414fa3/how_do_i_run_a_diagnostic_on_my_whirlpool_dishwasher.pdfIn PDF document text
    • http://dinelak.rf.gd/bed_sheet_shopping_online.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/cannibal_2013_parents_guide.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_off00016c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C07 5500 bytes
SHA-256: 4b1f0ce87f30d4d507ded86a363866d98794febc3f5f170a7c4f0dc832a0ef4b
font_01_sfnt_off00017ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EC2 11184 bytes
SHA-256: 071c96795394fc08acb569167134eb571c22f6cfed3c9c8fb06945323ce7268c

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