Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ae1be9ff838b23…

MALICIOUS

PDF

85.9 KB Created: 2021-03-17 23:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 53da1d4f1ceb3f0f6a378f054da64e24 SHA-1: f19bb24327b05216480d70abd7991d426f0b110d SHA-256: 09ae1be9ff838b231707d61d85d5edf432539b37800190e178be66ff707cea52
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 0.9970

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://crophysi.ru/strik?utm_term=adding+and+subtracting+mixed+fractions+anchor+chart PDF link annotation
    • http://pinopizo.sportsontheweb.net/jozisanirefipurolis.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/jaYOVgd/big_windows_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/enLPied/friendbase_chat_create_play_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/V6gglGr/directv_app_on_firestick_tv.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/32054827069.pdfIn PDF document text
    • https://cdn.sqhk.co/jisanipu/J74iphe/identity_vs_confusion_importance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_11acfbbedefb4250a2a18e01fa312495.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kofabube/zaduwenixipim.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_5f9296f237eb487c8d52b79fa1af70cd.pdf?index=trueIn PDF document text
    • http://divasopib.rf.gd/60170391585.pdfIn PDF document text
    • http://posijibanif.epizy.com/vagoxajomulirurakutadinem.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_2a7eb9054532453cb1fb246ea8b191eb.pdf?index=trueIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_e1f9ad99235c42b181298d52b14325b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/nes_game_genie_codes_super_mario_3.pdfIn PDF document text
    • http://xufolat.atwebpages.com/amalia_andrade_libros_gratis.pdfIn PDF document text
    • http://dunixojojulif.epizy.com/english_tagalog_dictionary_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/yard_machine_lawn_mower_wont_start_after_winter.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_7e783715e2724369aa49412b9d38cc8d.pdf?index=trueIn PDF document text
    • http://baxewape.myartsonline.com/cephalgia_kronik.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_f44130946be74ff7ad5c982b6107bb4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/alto_sax_duet_sheet_music.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_3d8e4fa3bb12457b9514c16bfaaa48b6.pdf?index=trueIn PDF document text
    • http://xekazaz.myartsonline.com/zuwexupudisibesadurinover.pdfIn PDF document text
    • http://makuwuwamev.rf.gd/27213083339.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/59313148515.pdfIn PDF document text
    • http://resutujimi.epizy.com/cheering_squad_uniform.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_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 5600 bytes
SHA-256: 1155b90fdb851e503beb1be3185ee24989610aa7978cfdb49ec130c8e26c0b3e
font_01_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 11220 bytes
SHA-256: dbdfbb706000e69f03d044c471bb214682cb07b5e60ac9c7158e34758a2448e7

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