Malicious PDF — malware analysis report

Static analysis result for SHA-256 91513e7e9e269d20…

MALICIOUS

PDF

83.4 KB Created: 2021-05-14 02:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 590bbf2096621fecb98eb1c98bda435e SHA-1: 7f796d0fad73fe528d3357b73908941ffe74fbf2 SHA-256: 91513e7e9e269d20288992487c115834eaea8d01a3fb050736bcfaaff28ea44e
246 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and is flagged as a link farm and a credential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/koxumuz.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://zajinet.ru/strik?utm_term=how+to+get+catalogue+points+fifa+19 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450501/normal_6027ff923e8fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381302/normal_5fcef9fbc7eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_6049e59f61ad6.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/koxumuz.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/dugonevirufow_funeranegavux_gefiji.pdfIn PDF document text
    • https://badikodaxalele.weebly.com/uploads/1/3/4/6/134698448/lusabenel_delojere_zefasuvifas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470223/normal_5ff58b51747c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jirebonudur/dapetirevixobemuvib.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_9724bc30a3f74731bef69ae621367000.pdf?index=trueIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_cc720ca5c1ca42ed9a17e585e91c3115.pdf?index=trueIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_79b336ce81414b35991e676002d50326.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_c57d9d22050540bd8cb1c7158b61045c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/simple_and_compound_sentences_worksheets_5th_grade.pdfIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_dea62f026a654043b8a38a6e3248fdaf.pdf?index=trueIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_a4a7ff73eaa24d07b76089f9a08a31af.pdf?index=trueIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_d1e9617f47f34243a729733d80800e23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bb0ecf-1943-4c42-a849-3a80ea41e878/how_to_know_if_your_throttle_position_sensor_is_bad.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/35816374343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/babec67d-f654-4d86-b728-d8c94a32f0ab/wedebolarivuw.pdfIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_bdec05f8cf4c43baa8587bb1db588e78.pdf?index=trueIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_d3bccca5dfb04a0cbd71769a3763b1e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a6e061b-cc3b-4f0b-b56f-40b548b102c6/tidetabatilema.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_9bda34b60e4e44e1b5c2d028d0086218.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 5228 bytes
SHA-256: 66cc26c0450571a0cee5669712e0929207e00d85f45c0912597c29f2a7428d6a
font_01_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 10916 bytes
SHA-256: bd6a68f9c56377241cdc25710ebc2ff1a6b28d2ed36a474b6ba73ba006fc2912
font_02_sfnt_off0001317c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176