Malicious PDF — malware analysis report

Static analysis result for SHA-256 d141983889b824f8…

MALICIOUS

PDF

85.3 KB Created: 2021-06-06 07:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a582a729060de9a9884debf48bdb2ff SHA-1: d8c4a39c0a3b49f6e22b208cd42c6943c5759d1d SHA-256: d141983889b824f8ca33761834d867a3657832d339ca16b96aaf6c45959718bd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to educational resources, which is characteristic of a link farm used to boost SEO or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded URLs. No scripts were extracted from this sample, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/pbw?utm_term=determiners+exercise+for+class+7+with+answers
    • https://duvinibekumexeg.weebly.com/uploads/1/3/4/6/134677329/192a4b.pdf
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/xipenimurova.pdf
    • https://cdn-cms.f-static.net/uploads/4393755/normal_60170e7d72d3b.pdf
    • https://static.s123-cdn-static.com/uploads/4408186/normal_5fe0c77e6a4c7.pdf
    • https://static.s123-cdn-static.com/uploads/4369923/normal_5fc6f7471286c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://varulemenel.pbworks.com/f/moxeguzoxenewuzirunedemuz.pdf
    • https://uploads.strikinglycdn.com/files/a9297e56-2ab6-4992-9705-1df5ecb6f63a/feelings_and_emotions_list_in_spanish.pdf
    • http://ziriwuru.pbworks.com/w/file/fetch/144565560/4000_essential_english_words_2e_1_2nd_edition.pdf
    • https://uploads.strikinglycdn.com/files/0b7215c2-fc08-4f5f-bdd0-9820a91ffaf6/23729391213.pdf
    • https://uploads.strikinglycdn.com/files/b81eb5c0-f47c-41f5-b43a-ef2ea83fae9a/how_to_write_movie_story_format.pdf
    • https://uploads.strikinglycdn.com/files/a2e1c9c7-78aa-43ba-a04e-8cabba44bef0/gutalidexilu.pdf
    • https://uploads.strikinglycdn.com/files/fb629b22-5438-4e6e-a020-652bf3d8c427/cultivo_de_cactus_y_suculentas_nivel_inicial.pdf
    • http://serizedez.pbworks.com/f/what_is_8d_problem_solving_process.pdf
    • https://uploads.strikinglycdn.com/files/425a8dc1-ab32-4ce0-ab91-0e979be36fec/accu-chek_aviva_plus_manual.pdf
    • http://saxonax.pbworks.com/f/ventajas_y_desventajas_de_tarjeta_de_red_inalambrica.pdf
    • https://uploads.strikinglycdn.com/files/fdf766d7-9c12-4574-b031-b3af822febc9/69542748780.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011140.bin
b884e64d490670e1ee79011f00e61c6d3c84f94659ae25af0351da966ac9249d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 5360 bytes
font_01_sfnt_off00012372.bin
6f3a139717c212086b0cbbbfa3b62044ada312075e3e564dee7e8003a10e496c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 10784 bytes

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