Malicious PDF — malware analysis report

Static analysis result for SHA-256 48523f974cf80f66…

MALICIOUS

PDF

66.8 KB Created: 2021-02-09 16:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 17a8226576c610f21d8a6ed705d11744 SHA-1: 1ad5f42a829498717a48092aa6ff3d4d607bb3a5 SHA-256: 48523f974cf80f665676e10ae5367dd9cb4199cd75650f7b61fd92eff82e1da5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing targeting 'chase'. The document contains numerous external URIs, many pointing to disposable domains, and a specific action link that abuses a redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/guwabofofafekor.pdf.
  • 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://baarspo.ru/aws?utm_term=reciprocal+teaching+worksheet+answers PDF link annotation
    • http://sentytld.online/fukosamuzizupavejapatazaffqf35.pdfIn PDF document text
    • http://susurrus.space/56448181871ij38h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416791/normal_6007d29eb7fd3.pdfIn PDF document text
    • http://nejuwenazi.iblogger.org/94393613110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_60112017d957e.pdfIn PDF document text
    • http://lupaper.22web.org/nigilabinesaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_60154e8959419.pdfIn PDF document text
    • http://italystore.pro/didactica_de_la_literatura_infantilcw70y.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/guwabofofafekor.pdfIn PDF document text
    • http://wititabeg.22web.org/lemek.pdfIn PDF document text
    • http://jitokinut.iblogger.org/duborarivo.pdfIn PDF document text
    • http://lnstagramsecurity.net/50322618006wktwq.pdfIn PDF document text
    • http://menetufebev.22web.org/cell_structure_and_function_quiz_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417534/normal_5fcc5ef0a12f4.pdfIn PDF document text
    • https://namowabe.weebly.com/uploads/1/3/4/0/134000139/vusudedilomibikizato.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/3435772.pdfIn PDF document text
    • http://tawilexupo.iblogger.org/subject_pronoun_agreement_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/posufij/39667783562.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/android_sqlite_crud_example_github.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/kunozugimadebijaratag.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/mitsubishi_air_conditioning_manual_uk.pdfIn PDF document text
    • http://wadarudi.epizy.com/drill_down_report_in_abap.pdfIn PDF document text
    • http://tugepujato.rf.gd/86893506120.pdfIn PDF document text
    • http://denakisewir.epizy.com/94030711783.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_off0000c8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CB 5360 bytes
SHA-256: 57e665198e7acb165cb752a446bbca52be898cb9e8a23c3c763c368020443ee7
font_01_sfnt_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 10112 bytes
SHA-256: 842dafec28cb3b40502d4eb46e22cb6b4768db5d90cd57ddff91030bf8b3fee3

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