Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc5aea66271f990…

MALICIOUS

PDF

80.5 KB Created: 2021-03-08 21:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5419fc044cf70e21d46900b9c8bbd4b9 SHA-1: 598791b201c0c5e3fdd6470f92d9266b1d7bb955 SHA-256: 5bc5aea66271f9902f8eadc77da60cbd5a49e23f6fc48b530c0adfb83e22e00d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary malicious URL identified is https://botokaw.ru/strik, which is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://botokaw.ru/strik?utm_term=tipos+de+comunicacion+organizacional+formal+e+informal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5fe589aae0847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403820/normal_5ff1203465925.pdfIn PDF document text
    • https://buwipifigidorip.weebly.com/uploads/1/3/0/8/130813409/39cb774647.pdfIn PDF document text
    • https://wixuzezokanozav.weebly.com/uploads/1/3/4/6/134663812/kojarugemomepadijeri.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/jjhjqhc/rush_gi_lab.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/rPegehc/digital_marketing_job_description_skills.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/6BP7hjc/king_s_fund_report_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_60402e0fd9925.pdfIn PDF document text
    • https://cdn.sqhk.co/wemojezuvegi/hwgeghs/gizeju.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/Vgdhjij/97474272707.pdfIn PDF document text
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/6905326.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_95c440f51c1643b29b1c2babb23d10b8.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_f44abb7fb48544babde12bfaeb27d273.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_821994f50ca24cd3a598a587ddf7f2e8.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_e2b6cf7e74a740d4b7b97e50251523be.pdf?index=trueIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_7afcbd80fa8940e696577fa744b01549.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_bcf83bce72fe40b38bf805e2d0d84faa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/what_do_the_word_mowgli_mean.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_df391e9d207d4caaaa515afbd83db36c.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_48241e3a02874fbdbd8e5084a8a2d007.pdf?index=trueIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_af4e5783009f48929442040c465ad957.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timeziso/all_american_925_pressure_cooker_manual.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_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 5472 bytes
SHA-256: f10d647701f0e3ca63ffee8e561068857433ea8a0a5d36d46b201955e213fe18
font_01_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 11564 bytes
SHA-256: 5fa88203a535c4dd8792aac2635099a2c2e502b2014b208182ce7970831f60a1