Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43a5f97842466be…

MALICIOUS

PDF

73.4 KB Created: 2021-03-23 13:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f343d748106affb7e58a74c5fef47d22 SHA-1: 67118b15f5c7db7cadfa592664f83e95108db218 SHA-256: c43a5f97842466be633f46b379308ee9d241df9ea24285d15b09c8d44e4b6762
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://xajibur.ru/123?utm_term=casanova+games+free PDF link annotation
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/bf6829ae2d79b.pdfIn PDF document text
    • https://cdn.sqhk.co/mojazejo/FWhdygj/duwedikupazaro.pdfIn PDF document text
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/zefobu.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/fezoponenosemor.pdfIn PDF document text
    • https://valojeruxul.weebly.com/uploads/1/3/4/6/134681631/vifun.pdfIn PDF document text
    • https://bufitalusiwe.weebly.com/uploads/1/3/2/6/132682607/vafonip_wikaworasageze_daroxowok.pdfIn PDF document text
    • https://tivulose.weebly.com/uploads/1/3/4/3/134318041/nimevam-didowezibemofa-dufuferemogitaf-jewam.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/piwerojekopexoji.pdfIn PDF document text
    • https://likimipezerejo.weebly.com/uploads/1/3/2/6/132682052/e3864e5f4.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/62147741736.pdfIn PDF document text
    • http://xefopuro.mypressonline.com/xisezinudufibometugixak.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/gSjbnjc/wingstop_delivery_grubhub.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/8921724.pdfIn PDF document text
    • http://surupumigo.mypressonline.com/42536699811.pdfIn PDF document text
    • https://cdn.sqhk.co/wubofuse/w2jcheY/attendance_tracker_app_for_students.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/what_constitutes_a_breach_of_trust_and_confidence.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/VsfAFgj/4895052959.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_1b2f47e831e349849a30f60abba2049d.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_aedb1122ad0e43e4a012f9b0d2aa9ffa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazivemon/singh_is_king_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/8356058742.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/sekigoribinoxozubeduf.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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 5020 bytes
SHA-256: efd1fd9c69ab1b38e09c28d3c21875cf3fe49b1c767f2126555664efed2c59af
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 11020 bytes
SHA-256: cf26058588f326f89da6c10fa57ae4a890e1a2517dbedc4bbeeeddc4c9af4df0

Open this report in the interactive analyzer, or submit your own file for analysis.