Malicious PDF — malware analysis report

Static analysis result for SHA-256 109aa990fbad7d9e…

MALICIOUS

PDF

71.9 KB Created: 2021-03-24 13:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e23b0a809212cdf77669b2f824137bf6 SHA-1: 5bbf3e94488f1b5e34b7a398627f7ac1fcb14ea9 SHA-256: 109aa990fbad7d9ea062f65230563ccb77a6093c7fde7f4e4fa1a9720a7b4d1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/wix?keyword=building+classroom+discipline+pdf PDF link annotation
    • http://italywow.info/kajagufojcm9km.pdfIn PDF document text
    • http://kayikciakademi.com/juwipikiguza5jf8.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/93110744050.pdfIn PDF document text
    • http://busurman.space/tobumuduts6y.pdfIn PDF document text
    • http://ita-talia.fun/supply_chain_management_courses_online_india3zx2v.pdfIn PDF document text
    • http://xxlmature.site/plug_dj_bot_commands90gyt.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/hbaighh/stack_blocks_3d_level_134.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/how_to_calculate_line_of_best_fit_without_a_calculatordf26z.pdfIn PDF document text
    • http://ita-fitness.fun/7365176427r6sos.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/j8i3Mgj/connect_the_dots_for_adults_book.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvuzebilet/mOhggcW/58475582471.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/all_the_kings_horses_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/mjRgfgf/go_fish_card_game_for_toddlers.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/dFggbgh/kong_godzilla_news.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/canon_mf4700_user_manualjh8eh.pdfIn PDF document text
    • https://cdn.sqhk.co/jodariwem/TDHAWjj/the_last_of_us_2_wallpaper_ps4_code.pdfIn PDF document text
    • http://batmbatm.ru/nudorojofojazamb6sby.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/asus_rt-ac68u-firmware.trx_download.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/sKjgjI2/world_war_rising_command_center_levels.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_81c03a7d79b645f98a2dcd56877767cc.pdf?index=trueIn PDF document text
    • http://kikanelomer.onlinewebshop.net/can_you_keep_a_secret_redbox.pdfIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_c62ed4f171d24d4e8513a8ddb48417b8.pdf?index=trueIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_dba378f7eb584357929f875a717b79b0.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_031b1702ed2e4f6ebc4623f3dbc8bcf4.pdf?index=trueIn PDF document text
    • http://pozajuw.atwebpages.com/pirudoxabebisiv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 5524 bytes
SHA-256: c258f9b8f68cec28159c166a3887d0afe6613e0d59a34f49f494fd7091257def
font_01_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 11108 bytes
SHA-256: 4863a74c78132f38e1b01c76b93f5497609394fe94edb4f0e07c67c3b7ef7c0e

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