Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb635d04425ffba3…

MALICIOUS

PDF

95.5 KB Created: 2021-03-27 22:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55765eecf9f0a228ad21e48793a88ee3 SHA-1: 5c4007f3f919cfc9ed70d8f3b68b71c08c68ee0b SHA-256: fb635d04425ffba3633aba773a7856ce95a9adca4cea78e71c62f4d7d565bf73
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are to SEO-optimized PDF files, suggesting a link farm or content-luring strategy. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to drive traffic to external sites, potentially for downloading further payloads or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=everfi+ignition+module+1+answers
    • http://rmk4sale.xyz/armored_car_hd_racing_game_apk_downloadd2kze.pdf
    • http://airbin.top/fastest_diesel_tune_pro_series_drag_racing4mubf.pdf
    • https://luwozupewudaxu.weebly.com/uploads/1/3/1/3/131384663/1288de33ba7e.pdf
    • https://sisajubiji.weebly.com/uploads/1/3/0/9/130969075/boridozuwidi-lerolu.pdf
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/livivapupexep_togevalu_zujof.pdf
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/wugaduzabap-vufopimawot-pizetixazoja-makidazegubog.pdf
    • http://gratoram.site/ejemplos_de_texto_descriptivofqa9d.pdf
    • http://graatorama.space/20235698075jcvnf.pdf
    • http://medebupima.sportsontheweb.net/sketchup_pro_2019_license_key_and_authorization_code.pdf
    • https://lesamasipedu.weebly.com/uploads/1/3/0/7/130739144/2364435.pdf
    • http://fotubobuwenapu.scienceontheweb.net/binurakipivoxuse.pdf
    • http://kushtanash.ru/558984495908zds8.pdf
    • http://xabudumame.mypressonline.com/soluciones_hipertonicas_ejemplos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d007a6cc-c88a-4c1a-b3fa-ecb13724ca09/kung_fu_panda_3_full_movie_english_subtitles_free_download.pdf
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_b4a70cafcd3a44d0acbe204d0ba359ce.pdf?index=true
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_c789ea22321e4a05bda2916a54c0fffd.pdf?index=true
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_aa5a548d62e14ae4bfad3aec4d479905.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a6f09b75-6e4f-4e76-b320-1093d1d7c7f1/viduwedul.pdf
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_0a59a3ff276245b6b3b68b85839dfff5.pdf?index=true
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_91eb872cb7b14dd99f52a170af4f834f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8714bd4c-e6c4-478e-8328-36d57ae14992/pakedumegusi.pdf
    • https://uploads.strikinglycdn.com/files/0409d4a7-eb3e-4f16-8772-78878c8a04fa/10th_class_physical_science_textbook_telangana_2020.pdf
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_f9403f7f0aa042fe90df7e0deef3b1e6.pdf?index=true
    • 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_off0001337a.bin
f357f7eb45c0a1947f721efa0ff3b4c354ac0b862506f09fe6dbf35a99dfa455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1337A 5388 bytes
font_01_sfnt_off000145d3.bin
b5de197e45edfcdcc2db9d17596f2231c4295eff08748afd7bb33c84fa2fdaff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145D3 12192 bytes

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