Malicious PDF — malware analysis report

Static analysis result for SHA-256 92aff9222edc8f7a…

MALICIOUS

PDF

97.6 KB Created: 2021-03-16 08:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed152ab25f9e83464592b56b6218e5eb SHA-1: dad80a5d76d95a6f6a7d8129fd540afc0dbceac7 SHA-256: 92aff9222edc8f7a4b0a24b559e56c2c3d8b804e70e176b37b87b0811cc13cea
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains text related to free music downloads, suggesting a phishing or scam lure. The presence of numerous external URLs, including one pointing to 'seumenha.ru', indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://seumenha.ru/strik?utm_term=musica+gratis+mp3+para+celular+descargar
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5fe3be1fd47a0.pdf
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5fdef4f97be5a.pdf
    • http://instapriz365.online/pack_de_juegos_retro_para_androidgxsbb.pdf
    • https://cdn-cms.f-static.net/uploads/4424009/normal_5fd618e2e49b1.pdf
    • https://cdn.sqhk.co/sapidefapo/ihdiha3/sabirotekaloranulirunulod.pdf
    • https://cdn.sqhk.co/devisojop/1gckmjb/tabletop_tactics_vox_cast.pdf
    • http://migerov.xyz/54018379303klwlf.pdf
    • http://jumofusifabezol.66ghz.com/31043137352.pdf
    • http://christmas-gift.ru/fundraising_regulator_guidelines0d8t5.pdf
    • http://wegutamozeji.iblogger.org/nacte_guide_book_for_advanced_diploma.pdf
    • http://topmassage.net/46200865033f0f6l.pdf
    • https://cdn.sqhk.co/natokaze/jdhbgcU/5271161830.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_1bf1b07984244e2aa7b0c77b91545885.pdf?index=true
    • http://segenuf.rf.gd/dell_latitude_e5500_battery_price_in_pakistan.pdf
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_e0df2261b40a4b5e833637eb0311684e.pdf?index=true
    • http://nufavonazimu.epizy.com/52010915109.pdf
    • http://gotuwutusefaw.epizy.com/bejejuviretenabevad.pdf
    • http://ganesuk.epizy.com/fnma_underwriting_guidelines_for_student_loans.pdf
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_adc50a806fb440069d7da8c3990211fe.pdf?index=true
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_3ea6a19f3e95444b907d65987b3935a3.pdf?index=true
    • http://bividit.rf.gd/lezegerelapir.pdf
    • http://muzafevabuma.rf.gd/char_broil_performance_xl_5_burner_review.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f987.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 6744 bytes
font_01_sfnt_off00010a6e.bin
2f4bf8ef4b91c2ad1918d14764e8201a583e72728be13bd8c6e9d8a480563cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 5564 bytes
font_02_sfnt_off00011d44.bin
217025c06857e7dbf3a7fd1574633fa4c827938412de9a4acef1097b160dba40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 7064 bytes
font_03_sfnt_off000135f0.bin
e757b718707593012ac9fc5ade0032a61466eeca9a5eb2f135e5d6e3167b4567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135F0 12588 bytes
font_04_sfnt_off00015ece.bin
e39e02f6448ef010f5cd1855b80a5a26c4c17f880539df7bcafb4d5cc7a68007		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECE 16536 bytes

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