Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c0b552b8ac6cc2…

MALICIOUS

PDF

86.9 KB Created: 2021-03-19 10:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 40f55a5b01793d01c21ec12a158fcba5 SHA-1: 540fc5f369163da112a16118d0a49dd7673146b8 SHA-256: a7c0b552b8ac6cc21bd62c22de00f5a023de3c1c14574d312e38fce068cd29e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/strik?utm_term=how+the+grinch+stole+christmas+song+lyrics+trim+up+the+tree PDF link annotation
    • http://creampiepow.club/different_types_of_steering_gear_boxtg2br.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_6010f1f0a53dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402501/normal_5ff7f3bb1c9a6.pdfIn PDF document text
    • http://pexulisinipev.sportsontheweb.net/65499215155.pdfIn PDF document text
    • https://xefewovureku.weebly.com/uploads/1/3/4/2/134265706/a0c814.pdfIn PDF document text
    • https://kopexonazopur.weebly.com/uploads/1/3/6/0/136084177/94666.pdfIn PDF document text
    • http://samyog.ru/how_much_does_a_treadmill_service_cost8abbc.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/47302668180.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/1fa343dfc.pdfIn PDF document text
    • http://vandify.com/vivejatomapagadupanobexanqhdv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_6025e7a12a153.pdfIn PDF document text
    • https://loxajutuwaguxi.weebly.com/uploads/1/3/2/6/132681393/jonetaxizonovikiwon.pdfIn PDF document text
    • http://openplafond.xyz/xifazilonizuwa2z9ka.pdfIn PDF document text
    • http://hookup754.fun/fevonuliponixobofajevfjoff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_a599ef5dfee74085ba8dcd5b3b3e8fa5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d1f6e1-f46f-409a-9594-51c987372d24/tawapilamopuwobazob.pdfIn PDF document text
    • http://wizigipixe.atwebpages.com/sizoboxerixozibusonexozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb189e87-58e1-49b4-950f-02db4b522f37/gimp_vs_photoshop_which_is_better.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_33b14cbaab7c4c2eb8bb697202bd7b0a.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_74f6a938992a459597d080e911acd081.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_389d4115ceda43ef90738286b902258e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89d887e-20df-423c-90c4-63affcafbac6/zopiganajavogexilezoluri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0192e43b-c033-4a1e-8c0a-0324d02aa37c/sujetonodu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 5500 bytes
SHA-256: fcbcda98ed9025ce21fee56c025aa449671e0442c7d2eaf6a3147ad84f28f956
font_01_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 11356 bytes
SHA-256: 0e889ae27c0bbd66a22c86801195f0a1570767a0974fe36c0be4451a515938dc
font_02_sfnt_off000135d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D4 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660