Malicious PDF — malware analysis report

Static analysis result for SHA-256 7055c3421b43afcb…

MALICIOUS

PDF

79.1 KB Created: 2021-03-29 23:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5efd25e3156cc6f484ad6f4b004b9f5a SHA-1: 72d9b16cc4deca094c83df2113ec72eec88970b4 SHA-256: 7055c3421b43afcbccb17e62e3321182903cd25d5c1d706cd363146a45a9e4a8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://druttle.ru/123?utm_term=sydney+airport+train+central+station+platform PDF link annotation
    • https://gazonigupeti.weebly.com/uploads/1/3/4/8/134879892/ae2fd5.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomadu/IYngihb/clouds_movie_trailer_song.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/jamowin.pdfIn PDF document text
    • http://cmbclientes.com/chinese_word_for_pet_peeveg0qyl.pdfIn PDF document text
    • http://lazerepil.site/53341703734jogfe.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/w48iaOC/5756424689.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/9931892.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/5772747.pdfIn PDF document text
    • http://tonagruz.ru/xegafilawitcmbqy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449990/normal_5fc6a966677fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5ffe71f05f192.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.pdfIn PDF document text
    • http://babysampler.com/principia_discordia_portuguesj5dih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_6022baa21c244.pdfIn PDF document text
    • http://keepxufi.space/330168312989kau5.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/gdfieie/bandi_books_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/gjjjjjb/ninja_dash_run_mod_apk_latest_version.pdfIn PDF document text
    • https://lefexaro.weebly.com/uploads/1/3/5/3/135324439/fuvazosinigesi.pdfIn PDF document text
    • http://amaryllis.space/ingenuity_convertme_swing-2-seat_portable_swing_assemblyuy4tn.pdfIn PDF document text
    • http://damvglaz6.xyz/vekawomoketevufuwugivlt79t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_f96ea409087943b4b411851a933ba979.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_a51adc721a0140299fdbff89c3657c03.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 5508 bytes
SHA-256: e4bbb0a7a575b78bec251fa41e616f4571ce326e4afe4ec8af1ea88c06652821
font_01_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 10952 bytes
SHA-256: 0e9d2b9f7a579e5c4f6404ad92d7aa18ced5e6a35ad478ea7b9887951dbe7b66