Malicious PDF — malware analysis report

Static analysis result for SHA-256 43795207e0cf469e…

MALICIOUS

PDF

95.7 KB Created: 2021-04-07 04:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 405650dc1d71122c23e7a021178f33d2 SHA-1: 86745af77b34e2f539c01c2a2079135f44928bc0 SHA-256: 43795207e0cf469eaab4601e535ff578647f851cabb6a829f790485292de8ae3
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 0.9997

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://dafemum.ru/123?utm_term=alginac+comprimido+bula+pdf PDF link annotation
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/1b9116406607.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/jaXjbz2/dezuguzesewutifato.pdfIn PDF document text
    • https://beselawomipux.weebly.com/uploads/1/3/4/4/134472501/vamopejoridex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5ff4371880259.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/Srifge2/joresilojapobevura.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/gdHIWja/elements_of_design_space.pdfIn PDF document text
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/najuzofariwazisaso.pdfIn PDF document text
    • https://cdn.sqhk.co/digatamale/Hjj3heu/diamonds_imagine_dragons_traducao_it_s_time.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/Hgiicgi/dulejozatewumu.pdfIn PDF document text
    • http://vafakewa.iblogger.org/cheating_in_relationships.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_602451a25595a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6029c6374f5c4.pdfIn PDF document text
    • https://tixemuxizufog.weebly.com/uploads/1/3/4/7/134746981/zovewifafu.pdfIn PDF document text
    • http://kulefinimujaleg.iblogger.org/evening_dress_pattern.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_1041a9050c8b44d788798d11e401ed9c.pdf?index=trueIn PDF document text
    • http://xosevijus.epizy.com/the_reason_is_that_synonym.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_750b5b0770f34edc95ccc0c6ea15fa32.pdf?index=trueIn PDF document text
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_892a90488ec5468d99df9d564ed3d0fc.pdf?index=trueIn PDF document text
    • http://vafegomadi.rf.gd/instrumentation_engineering_books_download.pdfIn PDF document text
    • http://nuvezutonotogev.epizy.com/is_sony_xplod_subs_good.pdfIn PDF document text
    • https://c7ecfb45-4de9-4174-91ae-4a3416e09b0d.filesusr.com/ugd/fc4f66_da273d396d4446529b36aa00b3b7793c.pdf?index=trueIn 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_off00013339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13339 5428 bytes
SHA-256: 9090ffde784fe56256163a1a86dcccd1c5689c69d965edc81f08a02cab0ff248
font_01_sfnt_off00014597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14597 13916 bytes
SHA-256: d23c1ed01da74cf4d887851c4a6e3cb4ee103891ce2a12b7728485a2b8fa034d