Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e86208483aba52…

MALICIOUS

PDF

85.4 KB Created: 2021-04-24 17:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 954e138db61cca2981617f125a51ba0d SHA-1: 811097c167715f7eb09b86d18d02e5307c663fb5 SHA-256: f1e86208483aba5250401863759e3e4315fab914a2286e36021a64d25ee2b5d2
126 Risk Score

Malware Insights

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

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It contains numerous embedded URLs, with one notable external URI pointing to 'https://golowaki.ru/strik?utm_term=duromax+4400+generator+reviews'. The PDF's structure and the presence of many links suggest it is acting as a link farm to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=duromax+4400+generator+reviews PDF link annotation
    • http://bukuxojunuz.mypressonline.com/caries_dental_en_nios.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/ajahn_brahm_books.pdfIn PDF document text
    • http://pochta-24.cc/what_does_a_seasonal_retail_sales_associate_dowqkr7.pdfIn PDF document text
    • http://yoga-fitness.space/potty_training_in_3_days_reviewssrsjn.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/maytag_washing_machine_error_codes_f20.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/lafedubunukilojir.pdfIn PDF document text
    • http://vknart.xyz/how_the_other_half_lives_answersgaufq.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/67474485981.pdfIn PDF document text
    • http://formblckr1.xyz/45321940072rqoj9.pdfIn PDF document text
    • http://tuimag.ru/gutakuzibisidatomef3wk7.pdfIn PDF document text
    • http://probkin34.xyz/judagexi4so65.pdfIn PDF document text
    • http://familyit.info/kamasutra_book_wikipedia_hindi_free_downloadl6f8e.pdfIn PDF document text
    • http://premiumpornclips.com/yo_tengo_tu_amor_lyrics_in_englishlo0n5.pdfIn PDF document text
    • http://vseti.life/android_google_assistant_turn_offftois.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/25652573978.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fijumusuxolegoj.atwebpages.com/biblia_catolica_cristiana.pdfIn PDF document text
    • http://tunizalureb.rf.gd/subufukefagifogadiro.pdfIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_e2dfc3a76e304f5ba48c852d3bbc13c6.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_3467c4d30ffd42789bdc1b7b093a0478.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_a96901fde3a7494c9b4f4815ab4010aa.pdf?index=trueIn PDF document text
    • http://gevorewububew.epizy.com/how_to_write_code_for_dummies.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_d864bdf0c1e741758f7a597a2cf71c0b.pdf?index=trueIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_fa04afd007d441ba85aebe8ae7b19a0c.pdf?index=trueIn 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_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 5424 bytes
SHA-256: 93a823b390b3f0184e88e13c39e4cac09435e30d729c30427718d8c4fa919e0b
font_01_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 11712 bytes
SHA-256: 9170d124fb1085a23ec0355c40e2cffba7a55b3992f7f40e416f2aca95eafa3a