Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b78755bf30622f…

MALICIOUS

PDF

74.8 KB Created: 2021-03-17 02:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bacc2a2cd81239b8484cfd2c90d0b827 SHA-1: be490307027a5f2038a98bf6089aba1bc04f69d5 SHA-256: 00b78755bf30622f4aae34331504f48c6bd2f513630642675d6ca503dfb3b216
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a phishing or malware distribution attempt. The embedded URL 'https://nipisod.ru/123?utm_term=aiou+date+sheet+roll+no+slip+2017' is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://nipisod.ru/123?utm_term=aiou+date+sheet+roll+no+slip+2017 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499341/normal_600809959f13d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fc58529bcf8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405651/normal_5fcaaff89cc85.pdfIn PDF document text
    • http://help-nanny.site/avtar_brah_cartographies_of_diasporag5rpo.pdfIn PDF document text
    • http://copyrights-notices-helps.com/pupolubebo5hnvq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_601f3ee977bb4.pdfIn PDF document text
    • http://onlinetiser.website/etica_para_amador_resumen_capitulo_5_al_929up1.pdfIn PDF document text
    • http://dom-bita.org/how_much_do_salvation_army_employees_makereid6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413238/normal_600895a3f04e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_5fef0b1e79de9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379384/normal_5ffc83c9c840e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_6014459229ec3.pdfIn PDF document text
    • http://ipatovaalena.ru/guduzasavenujebisegibal5lvpt.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/bajuse/justification_report_converter_utility.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_f9c0ba818f3245cd90a9cf81ba2a41e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedimuta/maverick_et_732_vs_733.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_afa863b2de9d4b57ab78e3f7fdd7512f.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_ab6c678e17b44fee92dd91d8f4251f15.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_220b35d38d3e475ca3ab8a54406215e3.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_2c372c501047420cadd85ed1a9dcd999.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luropiw/audit_kick_off_meeting_agenda_template.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_37975ef6125f446682006cb2f91f8373.pdf?index=trueIn 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_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 5440 bytes
SHA-256: 0dd5f3fc610892a3efeefd0bac838b6d5e2f2699a1a49938ac94948d0c2aaf73
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 10608 bytes
SHA-256: 69c5ec4bf7160379e7daf5890d1ebcef5ac8dcaea5b15fde039de84b87a4d824