Malicious PDF — malware analysis report

Static analysis result for SHA-256 636e6e4e4c3a64b8…

MALICIOUS

PDF

62.7 KB Created: 2021-04-03 23:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 399b04f3eba0fe1f1c5b44ac41befdf1 SHA-1: f0bc7dc4a2ed106e7018965f90e17a9604ef6015 SHA-256: 636e6e4e4c3a64b86b289391a629031d6b55eaa6de0baaffddc2c085196075d3
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to printer issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9251

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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://golowaki.ru/strik?utm_term=hp+officejet+4622+will+not+print PDF link annotation
    • http://fuxutigox.mypressonline.com/25008358857.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/rukitigoposixejijotuwak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_604027e32bf91.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/Ffhibha/air_war_games_for_pc.pdfIn PDF document text
    • https://debimagobu.weebly.com/uploads/1/3/1/6/131637583/83b8c.pdfIn PDF document text
    • https://cdn.sqhk.co/gukomoluda/jejihid/wojenanuwaxulave.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/bjcgcie/move_apps_to_sd_card_samsung_a21.pdfIn PDF document text
    • https://sijetiwiriwex.weebly.com/uploads/1/3/2/6/132683168/fusuzipuzexak-jogugaxukus-nisanax.pdfIn PDF document text
    • https://jejademi.weebly.com/uploads/1/3/4/2/134266227/9187552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6062be091c356.pdfIn PDF document text
    • https://tulofezufiruz.weebly.com/uploads/1/3/1/4/131409090/1565550.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/Rnlheid/run_run_super_v_apk.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/abandono_animal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444100/normal_5fcc8eb1dc2e6.pdfIn PDF document text
    • https://filigewu.weebly.com/uploads/1/3/0/7/130738657/9678286.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a79c6309-487e-499f-a993-0ac454a400c8.filesusr.com/ugd/747acf_948150d4b07f437d9f690b005a678bdb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0533f93c-408f-42a2-8786-01f46e64151a/what_does_flo_mean_on_a_black_and_decker_battery_charger.pdfIn PDF document text
    • https://b7c0b8aa-2746-4b81-86ab-4dfcec723e12.filesusr.com/ugd/383078_8d85619b08f449178e68f8b0e35acc99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d210b6cf-6475-4bf7-947f-22dcf90f67be/macbeth_act_3_reading_comprehension_questions.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_988da3e115cd4b44a51d92aec6d3b4eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8e68cb-a939-4436-a7c6-25131011ca1a/does_target_have_sodastream_refills.pdfIn PDF document text
    • http://wazeniwemir.onlinewebshop.net/dekabonumepo.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_b98d26c053e146308406778834549af6.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_edd75d1bdaa44649a52be132999e3756.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 5124 bytes
SHA-256: 919b7b3555f1a3a10482c3e6f9792250b884a2434c02a8e60abcfaefb4d2ffd2

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