Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc8c8013d364f47…

MALICIOUS

PDF

155.4 KB Created: 2021-05-30 00:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 814b36861bc26dc8ba5e2c6914d340c8 SHA-1: e9a35a7cc22547cc63d960f6773b199a1316a84d SHA-256: 2fc8c8013d364f4769175592b4f67349ce1f9931b04c25e237dfdf5f0dcfadb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pelibifir.ru/123?utm_term=administracion+de+recursos+humanos+idalberto+chiavenato+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379618/normal_602b0685381b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_6007b82ba03ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_6013052115a32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fc97ea2b3421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_5fe890951bd16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_601baccc7d7d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377938/normal_5fcae849eb293.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/8955104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505102/normal_6005378042dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_605d917ba8f30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444092/normal_5fedbcfb4c88d.pdfIn PDF document text
    • https://kefozonijufan.weebly.com/uploads/1/3/4/6/134689321/4317068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490515/normal_6030f9363b313.pdfIn PDF document text
    • https://tuzulenoj.weebly.com/uploads/1/3/4/8/134866727/840238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_5fd82a8f1d1af.pdfIn PDF document text
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/kazezinobe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476577/normal_60047adeb9c2e.pdfIn PDF document text
    • https://kubududowu.weebly.com/uploads/1/3/5/3/135349078/4656640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_60618266866c5.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/007c5385-933b-4582-976d-c907e238d6fd/medication_dictionary_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ba607da-765b-4248-ba74-1e7b736fb718/kisevavuzebeberulepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2d47cc-30ea-4f1e-b2fc-ee61306cc726/12341980210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c2c92da-47b9-49f2-95a8-496d26508f87/fizolazagurarutuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ddf147-1fba-48c3-a6f8-93f60c319b73/warofodijapovixomujafago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61248e2-acfe-4c18-bf93-2d9df11f5c2e/how_to_reset_code_on_kwikset_smartcode_915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0cbf51c-28d8-4847-bac3-45708e25db80/sex_education_show_reviews.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_off00021f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F4E 5584 bytes
SHA-256: 885e3b35c464e08e3a5aedb7d03016f253c374a0b1a3c87c64b13cf4f3bb9282
font_01_sfnt_off00023220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23220 14244 bytes
SHA-256: fa0d2c803de6af24fe2e66b6578b53aaebfd94e6759962f025281e8b225408ad