Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b9ae61f46ff992…

MALICIOUS

PDF

82.8 KB Created: 2021-03-15 05:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1f89c9b56d3f90ea3fb49093c638b0d6 SHA-1: 52acc1f1104895cc7dcbe6e5901a8527333aea3f SHA-256: b8b9ae61f46ff992878f832cda0f412cae33896aa1ebffe30c73316f3721c91a
156 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 0.9998

Heuristics 5

  • 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.
  • 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=what+does+cardiovascular+drugs+do PDF link annotation
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/3cda921c.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/be0e18c29980.pdfIn PDF document text
    • https://zipofero.weebly.com/uploads/1/3/3/9/133999904/d70c6aa76ce43.pdfIn PDF document text
    • https://wozomeki.weebly.com/uploads/1/3/0/7/130776066/nirigizop.pdfIn PDF document text
    • https://rulesamafov.weebly.com/uploads/1/3/4/7/134768786/81b1a4683d.pdfIn PDF document text
    • https://cdn.sqhk.co/xifusajexom/m2tOZXK/zinipopivelumidepozedi.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/eKIhdfs/97776116490.pdfIn PDF document text
    • https://gamupizesusaza.weebly.com/uploads/1/3/1/3/131398140/56236f36a.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/noxugadovaj.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/cndeOja/propane_forge_idle_circuit.pdfIn PDF document text
    • https://fuwozubasuzej.weebly.com/uploads/1/3/4/4/134473550/nagejafaw_simamiwekuwex_kawuradaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivekanudoz.rf.gd/refusidumopuvi.pdfIn PDF document text
    • http://paxaxebox.epizy.com/zadunidokirududijapulitiz.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/garland_police_department_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/fixasudotutatudipufotuv.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/munawuwimotasanarusep.pdfIn PDF document text
    • http://midelex.epizy.com/sefukosanet.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/ca_dmv_real_id_application_form.pdfIn PDF document text
    • http://fufezexu.epizy.com/6673806727.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/voxogozopiretujewotipixis.pdfIn 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_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 5272 bytes
SHA-256: 4e98212a7a9b5341abbd4ab8e07e0a0ea6ed08ce79bd27475e2bf1a5c7f3a433
font_01_sfnt_off0001185b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 11092 bytes
SHA-256: 4875124e03945cf806914a88c1947a39e57a89432380a5d5602c55c45fda364e

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