Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d070d51b97a9cb…

MALICIOUS

PDF

80.4 KB Created: 2021-03-27 14:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9d7112595c07284fa9aaf2e11444bad3 SHA-1: b16e4aff3d0b917ddf33dec335485bbdaaf8c858 SHA-256: a9d070d51b97a9cb109eed909bdbb1677afb106c6b22806374dbc4e0cc4d3fa1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The primary malicious URL identified is 'https://midufefew.ru/strik?utm_term=stages+of+development+18-24+months', which is likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://midufefew.ru/strik?utm_term=stages+of+development+18-24+months PDF link annotation
    • http://kagivok.iblogger.org/definiciones_de_arte.pdfIn PDF document text
    • http://wuvagawok.22web.org/yamaha_mg82cx_setup.pdfIn PDF document text
    • https://vopasigujar.weebly.com/uploads/1/3/0/8/130813381/30e6297b8.pdfIn PDF document text
    • http://wagoxakedal.iblogger.org/54472816845.pdfIn PDF document text
    • http://zovibunuxesemer.iblogger.org/attestation_de_formation_en_informatique.pdfIn PDF document text
    • https://molawakipo.weebly.com/uploads/1/3/1/3/131379716/roditena.pdfIn PDF document text
    • https://numevajuga.weebly.com/uploads/1/3/0/9/130969633/2754280.pdfIn PDF document text
    • https://nezododirexu.weebly.com/uploads/1/3/0/8/130813510/nolujidenixeduvano.pdfIn PDF document text
    • https://widalafamibag.weebly.com/uploads/1/3/0/8/130814492/9209439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa815fa1-b0da-4be8-91df-b02b4143d853/51999365633.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_a558a871a57f47b8a4146cf33ef9fd45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bepukuba/nanunapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e4dac2-3b68-4796-9002-ae4a80dcadc1/37316265330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbaea786-b30d-4377-ac88-e91b7d855a89/stihl_hedge_trimmer_attachment_for_strimmer.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_c02de086b2f34dd1897aa8a28aa63230.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2b89d9-c3b8-4af6-8bff-e9b026d32ba9/lajovomexif.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/vivari.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_f0af244722b84daba228c4694d04fc04.pdf?index=trueIn PDF document text
    • http://fusarafabar.epizy.com/strategy_execution_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cdf1044-2068-452e-b46f-8ed89e17bca2/par_q_and_you_2019.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_5d7f16308120416d9978a05db6d5b691.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezorito/global_competitiveness_report_2017_vietnam.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_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 6020 bytes
SHA-256: 21347634ee254eab1dc9774e05c6e73a1adf85d1f039f6e002be2b39fff4b4af
font_01_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 10576 bytes
SHA-256: 7ff09febaeb7ef8677571ef279ba58da6af96d9a76e82683734a15c6d676c1b0