Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f1b4e9f1b1659d…

MALICIOUS

PDF

80.8 KB Created: 2021-05-08 18:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4292df58c0006354056b9f334699f7c7 SHA-1: b889fd85d72cbca790445b6ab993919454506ca4 SHA-256: 04f1b4e9f1b1659d79a26bbdd0312747df5bf020ea6583b83febc186307966f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL suggesting a phishing or spam campaign disguised as a search result. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive link farm point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://dafemum.ru/strik?utm_term=instantaneous+velocity+formula+without+calculus
    • http://xujukalol.iblogger.org/carcinose_pritonale_diagnostic.pdf
    • https://cdn.sqhk.co/jumivosokigo/KiijiqU/sniper_ghost_warrior_4_download.pdf
    • https://cdn.sqhk.co/xaselavub/dhdjggM/79877716463.pdf
    • https://cdn.sqhk.co/miranilu/hb0zJhE/zutotonizitumenasupuroxaj.pdf
    • https://cdn.sqhk.co/samigimas/f70ijg8/80073955967.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_16ec2e951bc848fa95e8dc905ba87e1e.pdf?index=true
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_da39600475f447799afab22646a88afc.pdf?index=true
    • https://s3.amazonaws.com/woxotopapozokev/what_are_the_types_of_parameters_in_python.pdf
    • https://uploads.strikinglycdn.com/files/ebe38ccd-1778-4ab1-a1cf-2e6c62e5b60e/costa_habits_of_mind_list.pdf
    • http://julexobe.rf.gd/dogomifavidulesokomizu.pdf
    • http://puligop.epizy.com/55207540529.pdf
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_c224fd3c751349be8a316879ec9d7ffa.pdf?index=true
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_2080f0b03e604548b791bae6bf9f4780.pdf?index=true
    • https://uploads.strikinglycdn.com/files/957adab5-fe6a-43b6-8ec1-d3203200d619/java_programming_interview_questions_for_selenium_testers.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/425499630.pdf
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_3c5093c899194832b0824903f8cb1d1e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/912291ee-d7e3-4efd-9868-b2252527fd48/how_to_trade_forex_market_gaps.pdf
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_0c32b0ce02814008ab640f7d58c88b7e.pdf?index=true
    • http://girinuluzu.rf.gd/show_your_work_austin_kleon_free_download.pdf
    • https://s3.amazonaws.com/dixaleko/71947906547.pdf
    • https://s3.amazonaws.com/lazesej/hot_rolled_stainless_steel_sheet_in_coil.pdf
    • https://s3.amazonaws.com/tasufagijaremo/kipizibunujavisobiketi.pdf
    • http://gopogawamo.rf.gd/53691869759.pdf
    • https://uploads.strikinglycdn.com/files/231be532-0454-4cf3-95a7-8bc181d000ee/what_is_my_fasting_challenge.pdf
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_06be665ea96a4808a421df416c66bc80.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_8688678f4d9b4ddcb16a0d4f4fc6830c.pdf?index=true
    • 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_off0000fd5b.bin
648fbeed995c225658447eab233b3807a922df6e21a8628f586e5e992ab20e77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 5312 bytes
font_01_sfnt_off00010f5d.bin
c0c1e1c0d6292633843f40426f13955c7b1c75907bfa5cc9660f5ce7fd340058		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 11048 bytes

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