Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ceeae7178fda9a1…

MALICIOUS

PDF

72.3 KB Created: 2021-02-23 23:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d052832049aa8a60370795cb3c5c49b3 SHA-1: 4df1e0a229fbb32ab78407ab6045efc6d085dc46 SHA-256: 1ceeae7178fda9a156b9e761b647ddc7f4586f2e9a68ee7d1c17acf7f5b64e24
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to CV writing, directing users to a suspicious URL. The presence of multiple disposable hosting domains and link farm heuristics further indicates malicious intent.

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://bologen.ru/strik?utm_term=should+i+write+my+hobbies+in+my+cv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403560/normal_602a568fc3a55.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/S8My4ra/44380360348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_5fd9a494ddea5.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/jgXhiwB/8583745789.pdfIn PDF document text
    • http://pagebake.com/nebijiduzlih8.pdfIn PDF document text
    • https://cdn.sqhk.co/zimamoko/bidIjjP/fewinolodajologurekeru.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/jjLYXje/57940385582.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuwaxisiw/bgjjghb/fofegusesutif.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/jbhfg0z/cross_stitch_kits_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_6026f12195aba.pdfIn PDF document text
    • http://shoop-fk.ru/how_much_horsepower_2020_mustang_gto5tew.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/jfAjakK/doodle_jump_online_mobile.pdfIn PDF document text
    • http://nat-yoga.space/prachi_biology_class_10ybd42.pdfIn PDF document text
    • http://kalulib.iblogger.org/20008725631.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodezuraweba.rf.gd/87172055898.pdfIn PDF document text
    • http://kifugelewepin.epizy.com/widal_test_report_normal_values.pdfIn PDF document text
    • http://kuxixatizoxop.epizy.com/gezorupuv.pdfIn PDF document text
    • http://danofawo.rf.gd/minnie_mouse_red_bow_template.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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 5464 bytes
SHA-256: 9f79482b9042b3cdc1610aa89fa4c628189ce674ba5c140cf2779fa6582672cb
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 9928 bytes
SHA-256: 7a82e399aa0d0bf3ecfe2d5bb8761f5741fe49582321608f47af03fb9b964990

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