Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b23ec5e0ecf5320…

MALICIOUS

PDF

75.1 KB Created: 2021-06-08 13:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dffb305c9178a74774bd7a57369c6af SHA-1: 786fbddf81c623274593377c60581297b746e1a4 SHA-256: 1b23ec5e0ecf53200a4d81de41a21d7cd48d0f8a5fc1ceaabf26907fca5b9583
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://archism.ru/pbw?utm_term=como+hacer+claves+en+gta+san+andreas+android
    • https://dewosuto.weebly.com/uploads/1/3/1/4/131453399/33c4428d7d53934.pdf
    • https://serogewuf.weebly.com/uploads/1/3/4/6/134615077/bf0a13a5.pdf
    • https://fisuxujatuma.weebly.com/uploads/1/3/5/3/135345375/loxasixi_kirebusore_jimetidiwa_bulavamujig.pdf
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/3d757ecc3266.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tazijebep.pbworks.com/f/how_much_is_a_sheet_of_corrugated_iron.pdf
    • http://tusawijer.pbworks.com/f/cuaderno_de_trabajo_de_matematica_inicial_5_aos.pdf
    • http://wenitat.pbworks.com/w/file/fetch/144546642/posedar.pdf
    • http://dipazuwawex.pbworks.com/w/file/fetch/144596739/vepeku.pdf
    • https://uploads.strikinglycdn.com/files/dbe6f5d5-b590-43eb-af7c-e7d3e474c168/married_life_up_piano_sheet_music.pdf
    • http://xafusigivu.pbworks.com/w/file/fetch/144663039/power_iso_product_key_free_download.pdf
    • http://fokopaviwu.pbworks.com/w/file/fetch/144474417/kt_tape_full_knee_support_instructions.pdf
    • http://kuperuxowix.pbworks.com/w/file/fetch/144670344/bilunavefopogobeso.pdf
    • http://xigivesupi.pbworks.com/f/aiag-vda_fmea_handbook_2019.pdf
    • http://dobifapig.pbworks.com/f/xuwadebom.pdf
    • https://uploads.strikinglycdn.com/files/d9b57c0b-4fec-4e8b-a677-a4d0288f99d5/fadumapaderadugixalib.pdf
    • http://kukepofarit.pbworks.com/w/file/fetch/144588987/govurumivasivoxol.pdf
    • https://uploads.strikinglycdn.com/files/b8e79a29-6128-4fa3-be57-b34631c2b2fa/rotojela.pdf
    • http://vikiruji.pbworks.com/w/file/fetch/144716889/vidazudiwosaneka.pdf
    • http://kokoxudalux.pbworks.com/w/file/fetch/144426924/biofloc_fish_farming_training_manual.pdf
    • http://kigemulu.pbworks.com/w/file/fetch/144538464/uniden_800_mhz_300-channel_base_mobile_scanner_bc355n_manual.pdf
    • http://pivumiraw.pbworks.com/w/file/fetch/144836571/flash_all_bat.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_off0000e57b.bin
8c878d626f7a99b0e7d6b9e5538051d9e4716c183440c3de8426c8ca8db1eeab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 5316 bytes
font_01_sfnt_off0000f760.bin
83851a07e358c69a2c5a121fc6bf911fbb871989c3d936c25fdb4f97453893bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 11652 bytes

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