Malicious PDF — malware analysis report

Static analysis result for SHA-256 7288fc7c32c07edf…

MALICIOUS

PDF

72.9 KB Created: 2021-03-24 04:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c4f96f72c4f0f21169fc96b357d0cae8 SHA-1: 1892f50c122fabbfac0fe7a77506ac8b4d39e933 SHA-256: 7288fc7c32c07edffbe8f3ed1af51e5b9dc06488c0381a2eb9d5a64523864806
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://kuzutuzo.ru/strik?utm_term=fundamentals+of+industrial+hygiene+plog+pdf PDF link annotation
    • http://naturaleone.space/4178222924ugvli.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/analytical_methods_in_supramolecular_chemistry.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/79323112335.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/bsnl_prepaid_tariff_plans_in_up_west.pdfIn PDF document text
    • http://pochta-24.cc/philips_norelco_multigroom_5000_walmartpbhh0.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/81bc0964-fb32-49a0-b3e7-be37b118505b/95552702863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd6852d-0d6f-498a-a584-c8f85be46774/how_do_lionfish_adapt_to_their_environment.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/pinaturiroruzonujote.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_19799b448d1a49b3a89ab4fcbd35ef94.pdf?index=trueIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/34082109887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c16dd8b-2973-4cfb-afc4-adb4208a64af/bissell_powerforce_bagless_6583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fc8a6e-5a84-4465-8e0c-80df1f70295c/what_undertones_are_in_mindful_gray.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_6ecd53f9e8514b048c549fef3a29c19d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/merriam_webster_visual_dictionary_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56df0d41-22f7-451b-96b5-8d6cbf6eef94/90055371134.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_b5cade17be404f39b0247a526008b468.pdf?index=trueIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_a8c1892327634ae692e269bc7003cf0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/67201708579.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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 5512 bytes
SHA-256: bcf115d3f1ea45d8a1ea69576b1cb1a5f196f02e4fee6943a4c82c7aab5ac276
font_01_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 10648 bytes
SHA-256: 9c343e7007283a7f26e1c312fc53a14c716c8b96364bf0439519bfdc33f51522

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