Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6e3369e4f231ac…

MALICIOUS

PDF

73.6 KB Created: 2021-03-17 11:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaa28107c85ba29764649f32ad35d1f1 SHA-1: df513755ebc245cd65e025d82fd30570e7b2ed6a SHA-256: 8b6e3369e4f231ac2390719cfc82b67983f7a7754c170ee863bf4686956821dd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as academic papers or common document types. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/strik?utm_term=introduction+to+elementary+particles+griffiths+pdf
    • http://gosoxegekiri.mywebcommunity.org/senejo.pdf
    • https://cdn.sqhk.co/jigavozef/hhghlaS/strawberry_shortcake_recipe_with_fresh_strawberries.pdf
    • https://cdn.sqhk.co/nivuduful/x7jjdge/harrison_bergeron_questions_and_answers.pdf
    • https://wipegozi.weebly.com/uploads/1/3/0/9/130969535/ninak.pdf
    • https://cdn.sqhk.co/zisubiziwu/bhd1cj2/download_game_cooking_master_fever_mod_apk.pdf
    • https://cdn.sqhk.co/tiwefuxab/ijfiagi/encyclopedia_book_set_price.pdf
    • https://cdn.sqhk.co/zoribakim/fRifdQr/at_t_u-_verse_internet_plans.pdf
    • https://cdn.sqhk.co/zaxuloxedu/rqidheg/snes_controller_usb_driver.pdf
    • https://cdn.sqhk.co/maxegugej/jg6xl48/jirosita.pdf
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/guwonujalafudiwap.pdf
    • https://cdn.sqhk.co/tosuwukiwate/jPtV5yR/not_pacman_android.pdf
    • https://cdn.sqhk.co/vewukiziwemi/Wmggtij/62372100772.pdf
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/difofisakowujaje.pdf
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/951acf.pdf
    • http://dotixomovi.sportsontheweb.net/50875661062.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_16865c208d4e4155b4c4be5887c30832.pdf?index=true
    • http://lobopekogolo.onlinewebshop.net/calendario_mundial_rusia_2020_espaa.pdf
    • https://uploads.strikinglycdn.com/files/d3cdcb19-cc13-4c1b-9eda-34182f1433bf/craftsman_1_2_hp_garage_door_opener_replacement_parts.pdf
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_6f9c5056eee249528b68e7133cfcb0c9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2d9798ed-4859-45c1-a3b5-bc92181b296e/49883046673.pdf
    • https://uploads.strikinglycdn.com/files/9c75cbda-57e4-47cf-b895-7a28746ef7e2/52810954220.pdf
    • https://e4dd5bf8-bd13-43e3-b37b-9624b2564f03.filesusr.com/ugd/093416_1261ba3b78ee4ee49fb1200e92e61fb0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dc6211c7-90fe-48f1-9968-a89c21c2f9ee/kulisifepodojubepurup.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_off0000e11d.bin
2b2fc723eaf4e084fe9337cfb62739dfa61cddd4f504fa594ff85b67062d953d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 5608 bytes
font_01_sfnt_off0000f409.bin
3ebb9d2b25a8820b56083e410e3d830641cc1955301e3f406e71ea85d9980e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 10836 bytes

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