Malicious PDF — malware analysis report

Static analysis result for SHA-256 6221b6c4f91a12f5…

MALICIOUS

PDF

83.9 KB Created: 2021-05-17 21:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5706835417441c216e4f29e4d43e0782 SHA-1: 263cef7c9e03558a02bfd4fee87e694b066f7ea0 SHA-256: 6221b6c4f91a12f5535b1d32fc51937a8a054d9ddf0f512d19f108a1518c208b
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDFs, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://pelibifir.ru/strik, which is presented as a search result for hair bleaching. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=best+way+to+bleach+hair+with+splat
    • https://dumosube.weebly.com/uploads/1/3/1/1/131163669/5143743.pdf
    • https://witirasa.weebly.com/uploads/1/3/4/5/134525236/33313abfc64a.pdf
    • https://dazarurizupe.weebly.com/uploads/1/3/1/1/131164120/078a8788903b20.pdf
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/mesubavabonerojowo.pdf
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/98e00832eb7b6f0.pdf
    • https://zutafagufagupak.weebly.com/uploads/1/3/4/2/134235067/kefufuf.pdf
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/mifowebikenagur.pdf
    • https://jewutejaj.weebly.com/uploads/1/3/1/0/131070173/ligokas_fuzeziro_lafukagegabo.pdf
    • https://duxakezise.weebly.com/uploads/1/3/4/7/134713437/sumif-levotes-pikatoj.pdf
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/zerotuketapodun-sixalixefu-wirivipumoj-fakiroroguwaka.pdf
    • https://xidiziwuzubiwon.weebly.com/uploads/1/3/4/6/134653180/284e5584f60.pdf
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/jedoxikoma.pdf
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/buwulilojow-zuzoju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/womirofop/geometry_inverse_trig_functions_worksheet.pdf
    • https://s3.amazonaws.com/mulerux/what_are_the_main_function_of_oxygen_in_geography.pdf
    • https://uploads.strikinglycdn.com/files/6a8a1ed3-8be8-4416-87d8-7716a3efc74e/nibex.pdf
    • https://uploads.strikinglycdn.com/files/422bfd65-cbbb-47b8-8982-7465f8f352a7/bemuxulenajudinizob.pdf
    • https://uploads.strikinglycdn.com/files/7700e188-6195-433f-8257-38f51113df28/vaniros.pdf
    • https://s3.amazonaws.com/jozaponi/weather_report_ferozepur_punjab_india.pdf
    • https://uploads.strikinglycdn.com/files/05b41608-ba7b-4b27-a9dc-0e9ac30d558a/somesufexi.pdf
    • https://uploads.strikinglycdn.com/files/eb1bddda-fa5d-47b7-af3c-59b2cec4077e/rolukakozetevazik.pdf
    • https://s3.amazonaws.com/fomudebipefasu/74774092142.pdf
    • https://uploads.strikinglycdn.com/files/ddfcbddc-70ae-401f-bdaf-aa8d05a21807/44679197311.pdf
    • https://uploads.strikinglycdn.com/files/753f6a00-9eb1-4e60-bbf9-04e3713efaf0/daniel_fast_vs_plant_based_diet.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd4b.bin
e9be59f06fe850a5d0a57cd1b95e2cb6326d1f862cae2e16f0015bced6915c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 5084 bytes
font_01_sfnt_off00010ebd.bin
cf243f4134477e8c555edaabbaf9de2b094ed96d1bee1f17c28a8109c3a19f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 10456 bytes
font_02_sfnt_off0001328a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1328A 4324 bytes

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