Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46bd5291f105f43…

MALICIOUS

PDF

93.4 KB Created: 2021-03-14 01:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bfca92a01827ce40af10f85bd8101196 SHA-1: f5f3d2a8010dfee3427027208e7be23278675c71 SHA-256: f46bd5291f105f437799d2d8896261adffe11f43fb084e167fc9b1915f9b3569
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document, likely intended to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://vilenefex.ru/award?keyword=jurnal+biosistematika+hewan+pdf PDF link annotation
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/ae5bc.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/revan.pdfIn PDF document text
    • https://wijuluvewez.weebly.com/uploads/1/3/1/4/131437378/sodexisarujex_gawoxivalefax.pdfIn PDF document text
    • https://sufexijim.weebly.com/uploads/1/3/4/6/134679247/f9120a38.pdfIn PDF document text
    • https://bekitatabegoze.weebly.com/uploads/1/3/0/7/130775701/7156947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_603d0af98d3f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_601ab89dd1d73.pdfIn PDF document text
    • https://sarofosifuzatu.weebly.com/uploads/1/3/5/3/135329924/d67f44c31fc.pdfIn PDF document text
    • https://wenilitedosi.weebly.com/uploads/1/3/4/3/134315728/8a232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_6023055520c35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_6014c546a4357.pdfIn PDF document text
    • https://jiwonilasipa.weebly.com/uploads/1/3/4/3/134313366/butuwefitesama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wibenuke.epizy.com/granny_mod_menu_outwitt_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/37425875430.pdfIn PDF document text
    • http://bekokapag.rf.gd/how_do_you_reset_the_service_engine_soon_light_on_a_nissan_sentra.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/apa_format_biology_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/edelman_trust_barometer_global_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/zotojefefetoropigenoxe.pdfIn PDF document text
    • http://zepotusetazokor.rf.gd/answer_legal_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7757b6eb-578a-49c1-9ae4-03050838d080/24616052827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e461477-bfcc-4b12-986e-00cca637256c/is_christian_healthcare_ministries_legitimate.pdfIn PDF document text
    • http://zegemipufe.epizy.com/87811153484.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/39657376039.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_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 5568 bytes
SHA-256: cb3d59df8b67d4294400343cfd91f9882c129fdc642eac23fca41fada8550d3a
font_01_sfnt_off000140fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FE 11616 bytes
SHA-256: 75a3f7f677371253e0a981504b5c11d8f02edeb2e49bd13cc3d5a8c3e4043af1