Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10ddcc1804a6ab0…

MALICIOUS

PDF

84.0 KB Created: 2021-03-24 10:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61da33f68c7f105c9bb934ecec0fb21e SHA-1: 5157e430695f0ec22fc94a24ae5775363e128e4d SHA-256: e10ddcc1804a6ab077958f917c3ce140deab837730928f562193963fb589d681
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' and another flagging an embedded URI related to 'avast+updater+registration+key'. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for downloading a secondary payload, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/wix?keyword=avast+updater+registration+key
    • https://cdn.sqhk.co/zefafulolit/jiigdjf/76178947250.pdf
    • https://cdn-cms.f-static.net/uploads/4444866/normal_6017a399e7618.pdf
    • https://cdn.sqhk.co/jovowosifo/XOjficC/42933461070.pdf
    • https://cdn.sqhk.co/resilano/baFBHTB/red_ball_gown_wedding_dresses_for_sale.pdf
    • https://cdn.sqhk.co/salipini/gcUiaCP/13299350439.pdf
    • http://lejunuzegakikuv.mypressonline.com/chefs_choice_diamond_hone_436-3_instructions.pdf
    • https://cdn.sqhk.co/malakizojaji/xhhQcgf/juvazuj.pdf
    • https://static.s123-cdn-static.com/uploads/4453100/normal_60066b252caf6.pdf
    • https://cdn.sqhk.co/sopiloroda/hx2Mmjf/zgirls_3_characters.pdf
    • https://cdn-cms.f-static.net/uploads/4498834/normal_5fd9b111eb860.pdf
    • https://cdn-cms.f-static.net/uploads/4389097/normal_5fe92c6c515ce.pdf
    • http://pexawegowe.mywebcommunity.org/how_to_write_a_paragraph_7th_grade.pdf
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6020a67c2ef8e.pdf
    • https://cdn.sqhk.co/puxolika/hhbvha9/free_ringtones_for_android_phone_call_back.pdf
    • https://cdn.sqhk.co/wugoselubiki/dEOjcIU/97164595823.pdf
    • https://cdn.sqhk.co/bavomizobe/hhkgcjj/jadoreneba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_3fa2a0b6a37747d4aeda32da8b99f09c.pdf?index=true
    • http://xomutojekes.myartsonline.com/97355966068.pdf
    • http://jototaniruf.rf.gd/pdf_compressor_mac_os_x.pdf
    • http://telusomabufa.onlinewebshop.net/xemaxokululim.pdf
    • http://sojopisosifa.epizy.com/anjathe_movie_in_tamil.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_fed9bdb942fe46dfbeb882e44ae28cf5.pdf?index=true
    • http://kutubuge.rf.gd/automotive_service_advisor_training_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb88.bin
5d460a7fbc69c09c14d19d6fd3ffb8b0b2f603921948c115e9237b634b70042b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 5192 bytes
font_01_sfnt_off00010d48.bin
3d3f1398b16745b147eb62878d0938e1ac1ff2469bcba3d0f9756d9fb1ad6325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 11040 bytes
font_02_sfnt_off000132e2.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132E2 4324 bytes

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