Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3d4cf627d313a2…

MALICIOUS

PDF

72.9 KB Created: 2021-03-26 09:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3c10c493fb543971184219e3a30792ba SHA-1: 36a2dab65deb66f6f428f0667d39c36d71da2364 SHA-256: af3d4cf627d313a295a5a2a89bd9e726518acb9e5803e2d60c3fd0b40fb66172
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://golowaki.ru/123?utm_term=printable+wine+bottle+labels+template PDF link annotation
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/munezibenuselis_nokaka_pinoka.pdfIn PDF document text
    • http://zijukikov.mypressonline.com/casio_fx_350ms_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449781/normal_5fe2de328ca0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_6033f1cbd11cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_60401e3c7cb4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366311/normal_5fe180e5bab96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fcfe5820b619.pdfIn PDF document text
    • https://zavifojixu.weebly.com/uploads/1/3/3/9/133997579/pofolikirixara.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/agricultural_science_textbook_grade_11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://birukuf.onlinewebshop.net/apics_cpim_study_material.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_a333091ecc1946b4858dc88b5ad6cf06.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_a70e0c94fdae428f9178d510f4c34847.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_69850940792d44569f492e0fc53ff29b.pdf?index=trueIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_c080357052c84c21b4484e2fd269375b.pdf?index=trueIn PDF document text
    • http://balanuvanatitan.epizy.com/vesitikoja.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/savawodomeleregepi.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/wonenalegaziwiva.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_3f4e20cd6a674c3db999cf59d9e8ab98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lososimap/does_fibre_cement_sheeting_contain_asbestos.pdfIn PDF document text
    • http://luremugaxufarup.epizy.com/rpp_persamaan_dasar_akuntansi.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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 5200 bytes
SHA-256: 450d678f63dbb9897f0d5529c1acb506505c56d5dd1ff2abaa44e074021fd660
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 10928 bytes
SHA-256: 8476f57fc23dad2f73443296de6a8d48615a2a567d6b62ae1c5784d68b0d1f81

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