Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e563bb6bf85c00a…

MALICIOUS

PDF

87.4 KB Created: 2021-06-07 16:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4e2ae960bb06d56a76e1e6e8c1876d4 SHA-1: cffba62337af30b15815a0b0cbf793637cf7dcb7 SHA-256: 9e563bb6bf85c00a7b0690a39e416d15e8ef9c7633540914749d06bfd951e82e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://nipisod.ru/123?utm_term=pneumonia+guidelines+2018+idsa', is suspicious and likely leads to a malicious resource. The document body is heavily obfuscated and unreadable, but the presence of external links and the heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/123?utm_term=pneumonia+guidelines+2018+idsa
    • https://datovize.weebly.com/uploads/1/3/4/5/134508179/10ec9fea.pdf
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/8ce4e16e7932.pdf
    • https://gorixiboxizamo.weebly.com/uploads/1/3/4/5/134589430/2198818.pdf
    • https://tawudefategubo.weebly.com/uploads/1/3/5/9/135974656/f536e.pdf
    • https://lurenejaxerugu.weebly.com/uploads/1/3/4/7/134728533/aefbe.pdf
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/56d22dbd.pdf
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/8517325.pdf
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/vivilofemeravi-nosetuluwidofev.pdf
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/1838608.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d4ea7329-f70b-4397-9489-a8fe07d88323/louise_hay_sana_tu_cuerpo_descargar_gratis.pdf
    • http://midevodimu.pbworks.com/w/file/fetch/144679161/8th_grade_coordinate_geometry_worksheets.pdf
    • http://redelaw.pbworks.com/w/file/fetch/144536994/pozamoruw.pdf
    • https://uploads.strikinglycdn.com/files/33ba327f-33d8-464c-81f1-57d4e3604cb1/37453146133.pdf
    • https://uploads.strikinglycdn.com/files/557b626f-b657-4c8b-96b7-bb6db2bbe38f/best_online_interior_design_course_in_india.pdf
    • https://uploads.strikinglycdn.com/files/13765c0a-c782-4e16-9ac3-fdb05813fd1d/baretuwewozanewuzujow.pdf
    • https://uploads.strikinglycdn.com/files/9f4eb045-0b05-40a9-b1c9-774d001821ca/vajikuborewifiz.pdf
    • https://uploads.strikinglycdn.com/files/ac74de12-1201-4991-ae7d-d90e725ffa82/rujufojug.pdf
    • https://uploads.strikinglycdn.com/files/8bafac03-c7a6-431f-8136-f7bd73223b18/pirotunonejokamaxixar.pdf
    • http://gatunam.pbworks.com/f/fizurig.pdf
    • http://kepojijudiva.pbworks.com/f/41526577136.pdf
    • https://uploads.strikinglycdn.com/files/ec3cf331-bb3f-45fe-8237-3e5930f72902/fapaki.pdf
    • http://wuxikadafi.pbworks.com/w/file/fetch/144598290/how_do_i_connect_my_wireless_earbuds_to_iphone.pdf
    • https://uploads.strikinglycdn.com/files/26ef78c0-d2a9-4c72-881b-d7580755d59e/bloons_tower_defense_6_infinite_money.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc45.bin
351bd98797982d63638cd71509c685b76b1aadc3d3a6053ea5ef23ec0745602c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 5572 bytes
font_01_sfnt_off00010f24.bin
9e819815767fb2b798fe5b1bcfe85add70a405d23c530f61355b17a06d332d96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 11880 bytes
font_02_sfnt_off00013742.bin
ec4e01bddcccca99ed43bd0ce4a655a00b21d54b202e678c34dc47c15c76a4ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13742 16756 bytes

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