Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fc68a65a36cd90…

MALICIOUS

PDF

112.2 KB Created: 2021-04-04 21:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 55ea9e433dadc97ecf214fb7dcd1ff42 SHA-1: a5d78f0770cebd70de0072bb4f0f2b7cac87c3f5 SHA-256: 51fc68a65a36cd9046ce70169f1b1a8014bdf53682970543819e5269ff76f7b1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/strik?utm_term=yang+family+style+24+step+tai+chi+short+form PDF link annotation
    • http://tiwunevebir.22web.org/rujofumub.pdfIn PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/3a593ad536565.pdfIn PDF document text
    • https://fifesijewawo.weebly.com/uploads/1/3/1/4/131412558/9424008.pdfIn PDF document text
    • https://lofegofo.weebly.com/uploads/1/3/4/8/134895749/9304271.pdfIn PDF document text
    • https://xitupiwe.weebly.com/uploads/1/3/4/4/134489196/5890191.pdfIn PDF document text
    • https://lutatodu.weebly.com/uploads/1/3/4/6/134697406/810233.pdfIn PDF document text
    • https://godanikepogi.weebly.com/uploads/1/3/4/5/134509841/1a3c67fd675.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/the_ugly_duckling_book_download.pdfIn PDF document text
    • https://kuvolobogon.weebly.com/uploads/1/3/4/0/134012650/4c58c85a5b90.pdfIn PDF document text
    • https://nesurufaratetud.weebly.com/uploads/1/3/1/4/131408203/budovazamidapiba.pdfIn PDF document text
    • https://xojurumute.weebly.com/uploads/1/3/5/3/135328527/2808034.pdfIn PDF document text
    • https://jimiporumina.weebly.com/uploads/1/3/6/0/136088268/e26cf96.pdfIn PDF document text
    • https://sotogirepatobob.weebly.com/uploads/1/3/1/4/131453915/walenarik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee3f50b-e9ca-4849-aed3-a02b0c324dd8/how_to_reference_online_journal_articles_in_apa_format.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/verbos_irregulares_en_ingles_conjugados_en_presente_pasado_y_futuro.pdfIn PDF document text
    • http://bunurakugixopa.rf.gd/beacon_health_options_appeal_form.pdfIn PDF document text
    • http://vaxeridijif.epizy.com/96221280478.pdfIn PDF document text
    • http://tidejixegiseput.epizy.com/applied_gis_and_spatial_analysis.pdfIn PDF document text
    • http://gadoxijumulop.epizy.com/webugofado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1cd203c-a057-48be-8952-91dac618174d/the_algerine_captive_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e13d087-51de-4019-8678-b59a44648259/6377230003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e91fa7-e284-42e8-a3d3-71832ade8c36/down_the_rabbit_hole_saying.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
font_00_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 39180 bytes
SHA-256: fda4e5999e42cb295111b337146c52e274e9f6cc334e125bcc3926e24a1bb630
font_01_sfnt_off000174fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174FC 5712 bytes
SHA-256: 2ce600780cff4a5660601348366e02f5e39b4c4648934bae06291a9440b7e027
font_02_sfnt_off00018865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18865 13724 bytes
SHA-256: e11ff5d7e7b550bb3608c0fe2c7e72f8b4478a8fc2984a88b17482b06f1820f7