Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5190a256e6d1ed…

MALICIOUS

PDF

73.3 KB Created: 2021-06-11 10:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5fd2ff7d960ba48f1d97f6c36d30f030 SHA-1: c0a23d4c852c9ea343a81c5480bd0a08ea38beb6 SHA-256: ef5190a256e6d1eddc6c1e4589daa245bea16e9ecbf17ad99a42d1d5d42f1a48
186 Risk Score

Malware Insights

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

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 0.9996

Heuristics 6

  • 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 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://ketchas.ru/pbw?utm_term=dnd+3.5+druid+handbook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416665/normal_6034bf5705262.pdfIn PDF document text
    • https://levonosaxedose.weebly.com/uploads/1/3/2/6/132695543/e4b240ef9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4389797/normal_60b783073b21d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fec06012bb7a.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/beliru.pdfIn PDF document text
    • https://wikivosunox.weebly.com/uploads/1/3/2/7/132741322/6833261.pdfIn PDF document text
    • https://mirijanonukuzo.weebly.com/uploads/1/3/2/7/132740352/wigon-tunutup-zupeve-biziwekibar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426280/normal_603c5e424948c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_603838b517140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367268/normal_5ff283842613e.pdfIn PDF document text
    • https://xoxopazivufa.weebly.com/uploads/1/3/5/3/135398299/kabozuxuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_6021a5eed1778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_603ac43560f18.pdfIn PDF document text
    • https://nufupegovofa.weebly.com/uploads/1/3/4/1/134131424/3fbf58d7.pdfIn PDF document text
    • https://bojurejid.weebly.com/uploads/1/3/4/8/134887271/bevefemepewa_mosegonefidez_tutovopofodonil_tarujor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_604064a6689fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_60b9e77cd627a.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/5a668985-b981-44a4-a543-c21f1f272936/tabla_de_colores_con_sus_codigos_en_html.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f4bd15-4bc3-4182-a6d9-b66f84d8ff6b/how_to_make_dominos_garlic_parmesan_white_sauce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38c8efa-45b1-458c-9412-cf9c8114c338/dave_ramsey_baby_steps_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f25902a-9b25-40b6-bf78-e26b1b403ea4/xurimefojere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83fbab0-dc9d-4b8c-98c6-d32570ec3277/xifokebofozovuriwize.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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 5224 bytes
SHA-256: e152dc6f43f64fac16473a00b35a3110abfb05bf5a0e5f14f3777ff018cfcb05
font_01_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 10948 bytes
SHA-256: f5c9cae16916ee6a691ee858ba9945712081b6e637e30076d44f58e73cecf155