Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e793adcc88e54e…

MALICIOUS

PDF

76.9 KB Created: 2021-03-18 06:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 062e82c4b9bb6a0944776e94d291d10e SHA-1: 7b8c7450b01c3124b904cfd08ff9ccf5afa7e7de SHA-256: 50e793adcc88e54ed10cadf92db5bedf08516705291e47ddf9e21be4f5c2a99c
134 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains embedded URLs pointing to potentially malicious domains, and the document body, though truncated, suggests an invoice template lure. The presence of multiple external URIs and link farm behavior indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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://jumiwimov.ru/123?utm_term=invoice+template+format
    • http://zasijeg.iblogger.org/bank_exam_preparation_tips.pdf
    • https://cdn.sqhk.co/rawerusiwala/EicCBn8/piginuxajefokoxepukanewam.pdf
    • https://cdn.sqhk.co/tosobulig/Z7ihUhi/73305181174.pdf
    • http://pobunav.sportsontheweb.net/tedexedilavoj.pdf
    • http://fixetufuzafix.22web.org/how_to_become_a_trim_carpenter.pdf
    • https://cdn-cms.f-static.net/uploads/4426687/normal_600ddcddc0d4f.pdf
    • http://naziniza.22web.org/hotmail_all_attachments.pdf
    • https://cdn.sqhk.co/gixedomawa/1AADjaI/gesuzixivisexozid.pdf
    • http://sowipilarow.mygamesonline.org/hp_elitebook_8560w_specifications.pdf
    • https://cdn.sqhk.co/kufejagefep/hhjjelS/pizilemitejibumigapuwijar.pdf
    • https://cdn-cms.f-static.net/uploads/4455370/normal_603e899ce75f3.pdf
    • https://cdn-cms.f-static.net/uploads/4459180/normal_6012bb23500f3.pdf
    • http://depovujakav.iblogger.org/electrical_engineering_degree_plan_utep.pdf
    • http://fovikoxesaweziz.medianewsonline.com/56639123860.pdf
    • https://cdn-cms.f-static.net/uploads/4420766/normal_600a51b4d9150.pdf
    • http://rexuwoxaga.sportsontheweb.net/pathfinder_bestiario_2_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_11ee4f5a4f214de08f6f44de7885cd26.pdf?index=true
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_d413a6da13224b28a25ab5da8a4c02ae.pdf?index=true
    • http://pavasokunise.epizy.com/sesano.pdf
    • http://bolororufe.rf.gd/loctite_270_msds.pdf
    • http://latuwukatagowa.epizy.com/luxulibamef.pdf
    • http://mekasesajiw.onlinewebshop.net/shatter_me_meaning_in_english.pdf
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_ed4b089678ac4b8482746aeded236875.pdf?index=true
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_1a591b38cd3c4949b1cf095830718b5b.pdf?index=true
    • http://zunuwovadete.epizy.com/ap_calculus_bc_logistic_growth_worksheet.pdf
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_927fe7fee2ec464c8cb10ec1d532650a.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_off0000eff4.bin
2fe54bdc466d8b72411d6fb0360d37429fd3a783c9ec2e7c361d85a1c7872800		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 4980 bytes
font_01_sfnt_off000100da.bin
9ffb31a9fb94561c9a5224c6f449fcca5db12219956d6ee5d9179b61b6bbeddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 11000 bytes

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