Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa460d9cd301b8a1…

MALICIOUS

PDF

74.6 KB Created: 2021-03-30 10:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6e65dd805a5960f227c6df85c394fe2a SHA-1: 173314e2f7a8767a44ff89c7c09a9bbab5c47eb4 SHA-256: fa460d9cd301b8a18eb0202a301c1eee5e953037d8509a1129b7dd3c2163dfd7
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with several pointing to disposable hosting and potentially acting as link farms. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used for phishing or distributing further malware. No scripts were extracted, but the presence of many external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=cellular+humoral+immunity+pdf PDF link annotation
    • http://fherixq.com/how_much_does_a_10kw_generator_costr7hts.pdfIn PDF document text
    • http://mojamozegibobav.22web.org/82711995043.pdfIn PDF document text
    • http://novuzigekisev.iblogger.org/piwevuvivofejogiruxukovux.pdfIn PDF document text
    • http://tigawadilen.iblogger.org/barthes_death_of_the_author.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5fd6644389c72.pdfIn PDF document text
    • http://ehaberdevlet.com/94511496684c0s7t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_604c9e8e7a9cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501961/normal_60467336256c8.pdfIn PDF document text
    • http://megatorg.ru/taxazowobugefukefagoq5jn3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451574/normal_6003dbc575cc5.pdfIn PDF document text
    • http://onlinetiser.website/lofapaweratiweferse8w0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_820a995812be4ceb974e8f1443c24859.pdf?index=trueIn PDF document text
    • http://miwefonozez.epizy.com/30344486275.pdfIn PDF document text
    • http://nujenikob.epizy.com/tenor_ukulele_dimensions.pdfIn PDF document text
    • http://pumokijovepipo.epizy.com/canal_digital_norge_tv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb5ef29-a5f4-428a-b7e3-f197c265648c/razor_a_weight_limit.pdfIn PDF document text
    • http://wisigisovet.rf.gd/58816757148.pdfIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_5289719370b647b9a6d3940e3256ca12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39dba2af-9368-47ee-926d-be765baafb9d/4509405411.pdfIn PDF document text
    • http://kojosire.epizy.com/73497337589.pdfIn PDF document text
    • http://sisigetevi.rf.gd/57562758071.pdfIn PDF document text
    • http://birijigasexow.epizy.com/archie_comics_riverdale.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_d7c0f397d7624d299267b2a63809e4c6.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_df00b21f867d4d0da30013c400f4bace.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d883d2e-abc7-4b9b-9a09-5e5c5f367b36/22971126149.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_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 5112 bytes
SHA-256: 80006770653cd80d59b52e0fe0694c099003d4e677b8cfb4ded1b7528cb732e3
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 10832 bytes
SHA-256: 9ce903b2a60e861a0adc64047ad59cb1bb9a0d72ecf5b522d2e102dac1577f3f