Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9a1ac7cfe672cf…

MALICIOUS

PDF

80.8 KB Created: 2021-06-06 15:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 44e1d73a5ef86e2341bc99b474cf3e05 SHA-1: 1410023fed88dda4594e1fa38cd8d43490a0d523 SHA-256: da9a1ac7cfe672cf755b7595f14bc7884934ebcbfdfe6396326dfd70544c475e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure and link distribution point towards a malicious document designed to redirect users to potentially harmful sites.

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://chcial.ru/pbw?utm_term=smith+and+wesson+m%2526p+revolver+serial+numbers PDF link annotation
    • https://gawejewigedek.weebly.com/uploads/1/3/2/7/132741035/runijebageg.pdfIn PDF document text
    • https://woxavadegiw.weebly.com/uploads/1/3/4/9/134902916/1428945.pdfIn PDF document text
    • https://kuboteradaragi.weebly.com/uploads/1/3/1/4/131482952/109ab545.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/3a53f792-0744-4c77-aa3d-69238c5c5429/ejercicios_de_tiempos_verbales_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91385081-4984-4096-8a65-fc279cb457c1/35996505484.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/f/gajinupope.pdfIn PDF document text
    • http://bibosopimugo.pbworks.com/f/gerunds_exercises_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e354f3c2-b4e5-47e4-87a9-f30abe916236/what_is_yes_in_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df6c667-8ee2-4e26-b169-191ba6d6a251/48_laws_of_power_audiobook_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82190075-26a2-498d-85f3-aa8b2d3035a8/watch_helter_skelter_2004_movie_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387a6a10-2598-4a49-8a20-25da8fc3c963/57188672039.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144521355/download_buku_materi_osn_biologi_sma.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/f/40803167331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea53d60-5c17-4829-a111-9653fc2f6916/fifty_shades_of_grey_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93fe3e03-024c-4491-b52c-dc7ab0bbd374/pigemuvuwalupe.pdfIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144720867/nuzefulujemomebijokawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36067d82-acbd-410e-9811-2a6dfe0ca09d/the_poisoners_handbook_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e63ae4a5-e272-4a34-930c-c6b5b46c2213/dewalt_cordless_circular_saw_18v_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84d7474-ecd0-47fc-b1b5-006d48c01e70/73078973935.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011b0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11B0E 17240 bytes
SHA-256: e66aa23450ebdae7dbbbb4f906d908e60cba76a0d45bf778a91786efe8e64673
font_00_sfnt_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 5132 bytes
SHA-256: 028a9a3394fe532cb1f153d3d847049d1b97b1fee3c21d2c65b48b0ce9391a32
font_01_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 11508 bytes
SHA-256: a43cb4f9b2755968e3b0f06939c7ca4a3e1e61257fe62c7624f4d73566529945

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