Malicious PDF — malware analysis report

Static analysis result for SHA-256 718c841a2d42ddaf…

MALICIOUS

PDF

82.7 KB Created: 2021-04-13 01:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 69f46b4bcc2d9cf39a04322dc343d403 SHA-1: e8f2862f96922ab4eb001e4a3f4dc1f55a4d86b7 SHA-256: 718c841a2d42ddaf087c0a9beb5103ac525ba7e27a0485cdc5f863728e60b40f
156 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 pointing to S3 buckets, suggesting a link farm or SEO poisoning tactic to distribute malware or phish users. The primary malicious URL identified is vilenefex.ru, which is likely used to host a secondary payload or redirect to a phishing site.

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 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.
  • 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://vilenefex.ru/strik?utm_term=omron+h3cr-a+user+manual PDF link annotation
    • https://cdn.sqhk.co/libidexa/igehhji/xodowivebuwenukafogoriwu.pdfIn PDF document text
    • https://cdn.sqhk.co/segexiji/iaha9u9/rowegotopuba.pdfIn PDF document text
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/223963.pdfIn PDF document text
    • https://balewurid.weebly.com/uploads/1/3/4/3/134307256/zigusobekurujepup.pdfIn PDF document text
    • https://gidedumewulo.weebly.com/uploads/1/3/5/9/135961218/ab93bcb93.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/jGaijlc/rocket_raceway_facebook.pdfIn PDF document text
    • https://vadanuburizupi.weebly.com/uploads/1/3/4/9/134901301/buzijivoki_degavidorejan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zidenigad/jipuzosomow.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/insurance_coverage_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/numipalumokapek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8058a9-f24f-4f94-a79b-143fe55b5cab/how_to_apply_for_maternity_benefits.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/cuantos_capitulos_tiene_el_libro_harry_potter_yla_camara_secreta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8560f5-56e6-48be-9f58-cc0e201871b3/siemens_plc_programming_software_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59668b3-9d28-404d-997b-cd9c32266919/legaw.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/how_many_views_are_there_in_engineering_drawings.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/call_boy_job_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/59615131398.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/69606395839.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/tafegelerikubot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14012e32-e31c-4250-bdbd-289c7618508f/57307828394.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/9098226442.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/appium_swipe_android_java.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/vojeviwebaretu.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_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 5260 bytes
SHA-256: 4254991da3e6a4a8a0dd747f86565cbd12798f42d61ae976f9d0ea0bfa0b99e6
font_01_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 11124 bytes
SHA-256: d8ab7cc917a6f1907a3aa9744be363020750d739ecb340bc4deee8517cf76466

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