Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f23dd01422564a…

MALICIOUS

PDF

117.3 KB Created: 2021-03-20 02:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf5c381460e2728ebbed6c82ec224a45 SHA-1: b09bbd9198267222d1541190c70e5ef87e5b783a SHA-256: 33f23dd01422564a50baba8ae8ccf50a766c0d838bd11e56dee4410750900b20
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, a common tactic for phishing or SEO spam. The PDF contains embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to harmful content. The presence of external links and the overall structure strongly suggest a phishing or malware distribution attempt.

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://seumenha.ru/strik?utm_term=is+there+a+season+two+of+nancy+drew
    • http://ins.expert/limavatafivefufomrt76r.pdf
    • http://detonic-ro.website/what_spirit_animal_are_you_quiz_buzzfeedoabh1.pdf
    • http://eurofamily.pro/supujofsdla.pdf
    • http://jadebey-x.com/minecraft_download_gratis_ultima_versao_2020_para_android7gqt7.pdf
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/9899651.pdf
    • https://minibomutax.weebly.com/uploads/1/3/6/0/136011914/2653186.pdf
    • https://cdn.sqhk.co/malofavu/4hdJibl/merchant_marine_ranks_wiki.pdf
    • https://cdn.sqhk.co/woselukafo/euMJIhf/cb_insights_glassdoor_interview.pdf
    • https://cdn.sqhk.co/juzilolawu/gfrihja/82866892678.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_03e142a7185648d5a06d4bce885c564e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cd31381c-dc09-468f-80d9-8ba357fb2156/how_much_does_it_cost_to_replace_a_glass_cooktop.pdf
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_27d5fd12423f436293947c8575616ed5.pdf?index=true
    • https://s3.amazonaws.com/sizabo/21393568263.pdf
    • https://uploads.strikinglycdn.com/files/fc319a06-625a-4db3-abbd-301d35d153a8/jomapof.pdf
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_73532e6470964296b60efcfe9134b037.pdf?index=true
    • https://4c38db24-2924-4bf2-81c9-04860d987a69.filesusr.com/ugd/a68d8f_611792bc86f94159962aa07f0d9d3f16.pdf?index=true
    • https://s3.amazonaws.com/widuxade/ramavopife.pdf
    • https://uploads.strikinglycdn.com/files/b7bc5092-d398-4588-b87b-9b02da6aef36/fojunorinebututebanesej.pdf
    • https://uploads.strikinglycdn.com/files/04f3a16e-ff49-4bda-88dc-2d6b842f8e58/hp_designjet_500_driver_mac_os_x.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018f17.bin
52eb2f0b661236f8a664cb00c1d5fb1bd074de6a390bc8009e59020f50a793fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18F17 5208 bytes
font_01_sfnt_off0001a0e3.bin
36e90c957a62656705fc0b7b738c27cc683b5309b0d85deabc6d4cc2a7a2651d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0E3 11496 bytes

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