Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b5ae9d956b5459…

MALICIOUS

PDF

88.1 KB Created: 2021-05-29 09:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8941951b76e385383a8d1a3e2dbe39e9 SHA-1: c3a484b3156ade104866a29d658ccdc3d1739daf SHA-256: b5b5ae9d956b5459452380c29571b4891edae76888c62d1f37ccfc2af6ca100e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file exhibits characteristics of a phishing or SEO spam campaign, indicated by the "PDF_SEO_LINK_FARM" heuristic and the presence of numerous external links, one of which is identified as a potential entry point for malware. The "SE_PASSWORD_ARCHIVE_LURE" heuristic suggests that the document may be part of a multi-stage attack, potentially encrypting a payload that requires a password to decrypt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jottigo.ru/strik?utm_term=nosql+injection+cheat+sheet
    • https://lotuvimipel.weebly.com/uploads/1/3/0/7/130739731/1891989.pdf
    • https://tudepaweper.weebly.com/uploads/1/3/4/6/134607512/lolorenud.pdf
    • https://roluwisotem.weebly.com/uploads/1/3/4/3/134368144/xufusetudega_bidadomob_fuzifeposamages_lotuditu.pdf
    • https://cdn-cms.f-static.net/uploads/4445104/normal_60436dee447be.pdf
    • https://cdn-cms.f-static.net/uploads/4366343/normal_605a49269bf9c.pdf
    • https://cdn-cms.f-static.net/uploads/4459164/normal_6011d9f31def3.pdf
    • https://cdn-cms.f-static.net/uploads/4366399/normal_60555cbfe8330.pdf
    • https://cdn-cms.f-static.net/uploads/4413980/normal_60462451bf4ce.pdf
    • https://cdn-cms.f-static.net/uploads/4478408/normal_6068c079e5cab.pdf
    • https://cdn-cms.f-static.net/uploads/4489054/normal_600b201ec202a.pdf
    • https://cdn-cms.f-static.net/uploads/4412568/normal_606c02fa2edfa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a5daf63a-dfcf-4d0f-84a7-236ef9dad7a9/vibujubabososuxirezeto.pdf
    • https://uploads.strikinglycdn.com/files/88442dc8-2e83-45d0-9374-50055c013c6a/how_does_a_satellite_communicate.pdf
    • https://uploads.strikinglycdn.com/files/3d98b6cc-cb5c-42ad-8a06-f6578e709fa7/gaxunuwusolo.pdf
    • https://uploads.strikinglycdn.com/files/13a388cb-7ec9-4811-9fec-9d6c77253156/61245731378.pdf
    • https://uploads.strikinglycdn.com/files/4dacb550-1b49-4559-aaaf-abfbd1a93e04/dopurezurijalif.pdf
    • https://uploads.strikinglycdn.com/files/3422998d-6f91-4e93-bcc5-5843cb0ac681/xukajelo.pdf
    • https://uploads.strikinglycdn.com/files/afa80043-1cf9-4e38-b3bf-95878f87bbc1/18403742623.pdf
    • https://uploads.strikinglycdn.com/files/45a4af86-1ca6-4140-a458-10346515093d/portfolio_outdoor_lighting_home_depot.pdf
    • https://uploads.strikinglycdn.com/files/350b93fe-1e2b-4624-9174-1b3798c3afb9/research_methods_for_the_behavioral_sciences_third_edition.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119de.bin
98a0f4d177a24ff01efe0340056d0416429a10d4821efe717904c015c95d1665		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 4960 bytes
font_01_sfnt_off00012acb.bin
7056c0e3b9ec3feb3d3210b1544fb72b2d3b44172fdfa26e3ca304a75490ea31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACB 11912 bytes

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