Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6171e505b8033a8…

MALICIOUS

PDF

67.7 KB Created: 2021-03-03 06:01:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3c0dc282ff56e7260ac62f15fa1f4869 SHA-1: d56000b3515c0fff204ea2357d2ec36f3543a46b SHA-256: b6171e505b8033a83e4bd2520e541ad4b70092be12720a17cab6f77f98516945
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=reading+scales+weight+worksheets+ks2 PDF link annotation
    • https://cdn.sqhk.co/nomitusibop/x4Jiijb/pacification_meaning_in_bengali.pdfIn PDF document text
    • http://strahauto.website/fast_racing_3d_games_androidr98ja.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/do_androids_dream_of_electric_sheep_chapter_10_summary.pdfIn PDF document text
    • http://telemprom.xyz/wuxigutipe6jvth.pdfIn PDF document text
    • http://youla-24.cc/bowflex_xtreme_2_se_home_gym_assemblyfyt8w.pdfIn PDF document text
    • http://pebotukanazi.iblogger.org/how_to_pair_onn_bluetooth_soundbar.pdfIn PDF document text
    • http://torixobo.mypressonline.com/what_is_tcp_ip_network_printer.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/wiahiic/lewidewop.pdfIn PDF document text
    • http://tihefers.online/new_life_foursquare_churchjk3dh.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/VjjaMHO/push_poke_pop_fidget_toy.pdfIn PDF document text
    • http://m-laskin.ru/all_saints_primary_school_peterborough_uniform1ylcn.pdfIn PDF document text
    • http://lightly.store/vubebuxigividosewevmprq.pdfIn PDF document text
    • http://stakingyfi.com/6338387209524fim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rivobuzuxi.epizy.com/ancient_greek_etymological_dictionary.pdfIn PDF document text
    • http://begokev.epizy.com/risk_assessment_worksheet_army.pdfIn PDF document text
    • http://mafixatoje.epizy.com/symmetry_worksheets_free.pdfIn PDF document text
    • http://luwawabegopit.rf.gd/90677541335.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC03 5496 bytes
SHA-256: 43b3beec7bad6d47c8ca791a79fa48df1091573785c292244b9f57efb427b947
font_01_sfnt_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 10284 bytes
SHA-256: cf016aa3da14b41ebd0f5b406b5664502a84358f950eca11ef33a242c0d8abf0

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