Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0405474bfd79baf…

MALICIOUS

PDF

72.0 KB Created: 2021-04-02 00:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 45133d869f04c53a8b4f1589675c6372 SHA-1: b4c31efff5adcb3cae7553c3b6ee3ace2f1a4f0c SHA-256: a0405474bfd79baf466f86eecb672ce5b228d6217f8c7dc6c1eacdcf94c87baf
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, a common social engineering tactic. While no scripts were directly extracted, the presence of many external links and the ML classification strongly suggest the PDF is a malicious downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dugedepap.ru/strik?utm_term=how+to+do+year+end+closing+in+sap+business+one PDF link annotation
    • http://lunamawel.22web.org/ballistics_forensics.pdfIn PDF document text
    • http://milanbeachs.space/pegexikadizoxelafasagefqlkjd.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/kedogofiz-kifamez-novuwidaka-kaviposegoj.pdfIn PDF document text
    • https://xaredeni.weebly.com/uploads/1/3/1/8/131871979/penenazotenixa.pdfIn PDF document text
    • https://jubagimijan.weebly.com/uploads/1/3/5/3/135333733/wiwaze.pdfIn PDF document text
    • http://nesobaka9.xyz/46527653853tsz2o.pdfIn PDF document text
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/keduv.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/pitajof_zirobimawagi_suxumegofa.pdfIn PDF document text
    • http://everydayy.fun/photography_company_profile_sampleh7b80.pdfIn PDF document text
    • https://fuzifilagowiw.weebly.com/uploads/1/3/4/6/134698760/fikisipukubibun.pdfIn PDF document text
    • https://sagabeju.weebly.com/uploads/1/3/4/6/134659190/taxodegodunebalopino.pdfIn PDF document text
    • http://siankaanmexico.com/35153346047qpl43.pdfIn PDF document text
    • http://fovajifep.iblogger.org/metformin_associated_lactic_acidosis_treatment.pdfIn PDF document text
    • https://dapalaboz.weebly.com/uploads/1/3/0/8/130874192/wozigabinimaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_16302897beaa42b7ad32cdf90d2fa591.pdf?index=trueIn PDF document text
    • http://lotawovuvowuk.rf.gd/busybox_android_installieren_geht_nicht.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_3147d93cd8014d91aff627bc019d62a1.pdf?index=trueIn PDF document text
    • http://xexisupakixamod.rf.gd/46610654257.pdfIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_7e510fc48cb44170ba92492670981aa9.pdf?index=trueIn PDF document text
    • https://a1caaca2-2281-43ca-b2b5-e8dcf6f2a4ec.filesusr.com/ugd/c6e36d_a5c980d275e84fc38139401573c9a5b8.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_0e2532ac98634cde8cff0aa8ff0589ee.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_89facfe36ce14785abf255ba27eb4093.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_off0000dbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 5536 bytes
SHA-256: 50e5cf49e65ff3b7aabee5ce016637acb764fed4f60930c0082a48e0605cc494
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10424 bytes
SHA-256: ed926eeefca184c64c30cde42c7e015d3941527d3820b403d6e427252a3c2392

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