Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e62bdbb01eff86d…

MALICIOUS

PDF

71.3 KB Created: 2021-03-29 22:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52a8b4bb829e2751f0edc00d98f67439 SHA-1: d645ecfa63382950bfbd7f79bc2658c3f6e0ede4 SHA-256: 0e62bdbb01eff86db13ad820d56d1d92b471ba1006997e8a4680c0c3c18fbee1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to 'crossword puzzle answers'. No scripts were extracted, but the presence of numerous external links points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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=chapter+15+crossword+puzzle+answers+medical+terminology
    • http://fisareboveda.getenjoyment.net/pinebowukizino.pdf
    • http://mexawolin.medianewsonline.com/87725500807.pdf
    • http://xudogiborijum.66ghz.com/mibimemaxazumaloboveb.pdf
    • http://juzajikadig.22web.org/kumowefuwugupewuxodojuzom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zoxuditavuvov.rf.gd/bitterroot_river_flow_report.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_d1a32e8cc74e4892bec8bb5bd5d5f6fe.pdf?index=true
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_4ab399c027d54547bc39995f8af3d57d.pdf?index=true
    • https://s3.amazonaws.com/jefobexapulow/cunto_tiempo_tarda_en_cicatrizar_una_herida_por_dentro.pdf
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_20030c062b0e47a7af70798f7fee0713.pdf?index=true
    • https://bed2724e-b6a4-42c6-a365-5b2dc6a82e2f.filesusr.com/ugd/9f087b_a7f39d949c504092ac2bf5d0ce6b8f92.pdf?index=true
    • http://dowirimidezifa.rf.gd/practical_seismic_data_analysis_zhou.pdf
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_a3c1758df24a4bd4a245c986b11d4610.pdf?index=true
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_aeabf9b5a18447a8920112f0a842cdf9.pdf?index=true
    • https://s3.amazonaws.com/juwofuxufijup/naa_ringtones_telugu_free.pdf
    • http://pamanivu.epizy.com/34395986111.pdf
    • https://s3.amazonaws.com/gogoxowiniza/m-audio_axiom_air_61_review.pdf
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_83200666394a4fda838c87bc32708916.pdf?index=true
    • https://s3.amazonaws.com/firudegix/accu_chek_guide.pdf
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_708101f1ee254833a5fbea0da79fa42d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78f.bin
802094b1c9f9762d126eba3137778247ca824bd1f56b13107683a83e25a17a5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 5812 bytes
font_01_sfnt_off0000eb4c.bin
5ec237b42546d1026e4966045ed1c53a5dfd91e30dcde58fe4eba376e00ae6e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 10880 bytes

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