Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4f195a5592ece7…

MALICIOUS

PDF

111.7 KB Created: 2021-03-04 18:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: caa96fb12f1793f37ea1ac175795c54c SHA-1: d78625d8c8130a621032c75ba58c058c5ca9ab3d SHA-256: 4a4f195a5592ece7a3fa746946fbbcfee2117f8c3b2ebe7ce633b549f4ad8f41
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bologen.ru/strik?utm_term=what+is+the+best+tao+te+ching+book PDF link annotation
    • http://serikanipesemo.iblogger.org/76717287152.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/surface_area_calculator_for_prism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_5fe7ca185a891.pdfIn PDF document text
    • http://peteferix.mypressonline.com/how_to_swim_with_the_sharks_without_being_eaten_alive.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/turbochef_oven_parts__accessories.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5fca3d86479d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_600fce2cd6767.pdfIn PDF document text
    • http://nefidale.22web.org/17101302291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_60306b60112bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_600fb14097230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421056/normal_6019afe1925a4.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/54998366426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446921/normal_5feb183b19971.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461748/normal_5ffe9b5c4fa76.pdfIn PDF document text
    • http://kisoxowizupoz.iblogger.org/maintenance_page_template_bootstrap.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/7569789864.pdfIn PDF document text
    • http://fejoromawefobo.22web.org/ielts_writing_task_samples_band_9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowokepo.atwebpages.com/ar_15_scope_vs_iron_sights.pdfIn PDF document text
    • http://pimifemegizak.epizy.com/gojunugosiw.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/asus_rt-n12_3_in_1_router_setup.pdfIn PDF document text
    • http://saliguk.rf.gd/demul_awbios._zip.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/68333471782.pdfIn PDF document text
    • http://genovadeni.epizy.com/bollywood_video_song_mp4.pdfIn PDF document text
    • http://nufesuku.rf.gd/first_aid_course_2017.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00013105.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13105 17600 bytes
SHA-256: 5c6f64e859ad0f1669f89a4a18aa92e4fcfeeff71d3e69e399f0845fa03d2826
font_01_sfnt_off000168fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168FC 5148 bytes
SHA-256: e48956ad6e663ffceef668253aee18338670f9727a62ef25e27068bc504a83e5
font_02_sfnt_off00017a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A96 18100 bytes
SHA-256: 02689336781e12d3d14d9303c28e9d98abe8c3db2e1d041ffd57bd6766a34fa7

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