Malicious PDF — malware analysis report

Static analysis result for SHA-256 20897957c6638353…

MALICIOUS

PDF

75.3 KB Created: 2021-03-29 09:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9b3abb05f8bab7e3bb910ceaaa0a8f7 SHA-1: dc32626d08c3ea27c78b2750d2856930e3f8a3e3 SHA-256: 20897957c6638353404cd4480f2ba4861e46f014fc30916f8bda2fd148fd4434
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The embedded URLs point to various domains, likely serving as lures or redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=good+examples+of+critical+thinking+in+nursing
    • http://respect-ltd.su/how_do_you_turn_off_the_security_light_on_a_subaru_foresterwmg6s.pdf
    • http://ouily.xyz/much_ado_about_nothing_theatre_castcaovt.pdf
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/bozujola-zijugedagebi.pdf
    • http://wordsidepost.top/jexowumabijapigokeg1g1o5.pdf
    • http://susasami.22web.org/723609456.pdf
    • https://kepubaxolawava.weebly.com/uploads/1/3/4/7/134703856/bunidufusagezotikaxo.pdf
    • http://toolsbestpricemicrometer.site/90338528919fiol6.pdf
    • http://bigops.fun/shopsmith_bandsaw_blade_lengthjcu5b.pdf
    • http://tesocoin.online/relacion_de_orden_parcialt30sl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wikevim.epizy.com/ropoxoko.pdf
    • https://uploads.strikinglycdn.com/files/4eba3a3e-41a9-4e70-8cf1-44bcb3951b3b/much_ado_about_nothing_act_2_scene_3_benedick_monologue_analysis.pdf
    • https://uploads.strikinglycdn.com/files/45d16555-c5a7-4ce3-a2cd-d9881e7f165c/true_detective_season_1_scripts.pdf
    • https://uploads.strikinglycdn.com/files/b78d5905-7a2b-482d-8f2b-5e184b4473d9/how_to_turn_off_cateye_mity_8.pdf
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_107a0c8e6d1d47bc97926eb5480d464a.pdf?index=true
    • http://nogapovo.rf.gd/fawatokekepaxuzod.pdf
    • https://uploads.strikinglycdn.com/files/10934206-a447-4e25-9b29-a2759a248e4c/zipefozo.pdf
    • https://uploads.strikinglycdn.com/files/a3f23b7f-aeca-4aba-b643-086905eff720/beats_by_dre_studio_3_wireless_over-ear_headphones_-_white.pdf
    • http://fodapimogu.rf.gd/fugago.pdf
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_a334aff5c8814a4f89b405b877d7818c.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_off0000e816.bin
82629c4807dc9c37c5267c419d7c75b55a8607eb854764f5b13f60b13084eed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 5732 bytes
font_01_sfnt_off0000fb76.bin
b9b2bbc5b4072f069b241be5e7f119f15c447ca6e812e41eb9ae7227f291558c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 10704 bytes

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