Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd127bbe51bb2e42…

MALICIOUS

PDF

82.5 KB Created: 2021-04-04 02:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 205de44583a7b437178e22f0813162f7 SHA-1: 5976f39af6f1f9543bd5c9fb422e2cb456f87abb SHA-256: bd127bbe51bb2e420c86671167427782802d8bff5b4918fa1a04cf074176dafb
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 0.9998

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://seumenha.ru/award?keyword=jurnal+akuntansi+syariah+pdf PDF link annotation
    • https://nikupotipemami.weebly.com/uploads/1/3/0/9/130969226/8364778.pdfIn PDF document text
    • https://nikovazof.weebly.com/uploads/1/3/2/6/132682709/gutowal.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/HHAigij/republique_bananiere_definition_en_arabe.pdfIn PDF document text
    • https://nulejekenafu.weebly.com/uploads/1/3/4/3/134367691/vuwunaben_ruzofizu.pdfIn PDF document text
    • https://supenavasude.weebly.com/uploads/1/3/5/3/135397397/woropagovewof.pdfIn PDF document text
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/jugefutis_xesisemejaduwi_datozutenupefu_kanapil.pdfIn PDF document text
    • https://gijowazav.weebly.com/uploads/1/3/4/0/134097260/xilozip.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/d5gekd0/67166268060.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/97bb75d5-bf09-4944-b703-509b2b043c49/nemonefosozat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27e4722-1671-4ca1-b6ad-e24b70cc1d8c/83790887372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf95c1ec-e0fe-4866-881f-0b0134a7c3f4/resiruxosubijavutuxizudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20ce5914-32ee-443e-a653-955d53180f60/88248073442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4d5f3a-902a-4350-bc8f-b548806d67b2/6497016483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc73e210-48da-48b5-92bc-aca1e0ac5f22/is_there_an_app_that_explains_bible_verses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd3db68-3125-4a45-a296-526f97a6d407/holy_book_quran_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c969278e-050e-4a93-a480-b577bae720e2/fijabuwazuzava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87580889-b5bd-4060-8aea-26dc760dc977/23959825001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e69d11-7a83-41ab-bde9-fcfec35c0201/67351489885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25bcaa83-47d1-4617-9ba7-b1bbe3d3b3ff/cabelas_meat_grinder_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd1ce92-a27b-465c-ad98-62e1e9c9bdf9/60078960884.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_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 5284 bytes
SHA-256: 9fa3d7bf95b321309fa100f1f8650184f13fd4a9cebe843726fd4c955abdc8d9
font_01_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 10768 bytes
SHA-256: 0eb3f71d327240d24d5ebffbfe8194399ef68b1bfd70a1f279e0487950289fc0