Malicious PDF — malware analysis report

Static analysis result for SHA-256 200fb8a52f650241…

MALICIOUS

PDF

72.7 KB Created: 2021-03-28 01:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5f7d69b43b3372e9798711d776b7b91 SHA-1: 290d1faa0a40d75fadc347b58db19099821013f5 SHA-256: 200fb8a52f650241555cb275397541f8ddc406770b3118502672485be412ac87
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many external links suggest an attempt to manipulate search engine results or distribute further malicious content. While no scripts were directly extracted, the PDF structure and the nature of the links indicate a malicious intent, likely related to phishing or malware distribution, hence the 'Spearphishing Attachment' technique.

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-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://cdn.sqhk.co/pujazojiwixi/6ujbsjI/71574406514.pdf
    • https://cdn.sqhk.co/xuvisisitinu/thihbpv/treasure_hunter_movie_tamil_dubbed_download.pdf
    • https://cdn.sqhk.co/bivuwusim/ijcQQyp/butterfly_printable_template.pdf
    • https://cdn.sqhk.co/lerapuraroke/Wihjcid/mx_player_pro_apk_free_download_apkpure.pdf
    • https://cdn.sqhk.co/noneniwetav/dZjjDii/mini_world_block_art_apk_mod_money.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/wb/ENAH/~3/dRGGkpkNhSI/wb?keyword=what%20is%20geronimo%20stilton
    • http://kilubediboxut.rf.gd/leziwusolupemu.pdf
    • https://uploads.strikinglycdn.com/files/6af9a549-2d34-48cb-a0f0-56f76a122bda/9121232095.pdf
    • https://s3.amazonaws.com/zamemigojat/black_little_boy_hairstyles_long_hair.pdf
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_b26df2d515a9437397ba4c7f0f4fda82.pdf?index=true
    • http://jerekapubujiw.rf.gd/ti-34_multiview_scientific_calculator.pdf
    • https://uploads.strikinglycdn.com/files/e5abe161-8500-4d16-ac32-b29cfb05e24c/purevpn_server_list_download.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/15723408704.pdf
    • https://uploads.strikinglycdn.com/files/5cac8914-4e13-4d99-9e15-71cc385a2767/15256973071.pdf
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_228222c833794a858647a1fca422880d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1b72f36d-7622-4476-9a3a-e15173b961a9/how_to_find_exterior_angle_of_a_polygon.pdf
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_52f94d8a330341c6864178dacc92b0e8.pdf?index=true
    • https://s3.amazonaws.com/vojapu/55310060430.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_off0000de9f.bin
f9c9c27f1c69f6cb05ed995996b6b1f94354c75dd727f202e1cd4fd6b01101e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 5148 bytes
font_01_sfnt_off0000f006.bin
b08104546cc7ff7653c08a135028c6a060ddbbc17a354854523b1ed0925435c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 11100 bytes

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