Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7f23a2cf5aaf58…

MALICIOUS

PDF

80.7 KB Created: 2021-03-27 22:49:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d72b9c889f09f165334dce31afc221b8 SHA-1: 5f0a911e81fbc1c6d676664072579bb0e5405da7 SHA-256: fd7f23a2cf5aaf587018fda13801beb94108d2e6756277a7101fc3f300d01507
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. ClamAV and ML heuristics strongly suggest malicious intent, classifying it as a phishing trojan. The embedded URLs and the heuristic firings point towards an attempt to redirect users to malicious or deceptive content.

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://kuzutuzo.ru/wix?keyword=escuelas+secundaria+tecnicas PDF link annotation
    • http://xomaweluk.22web.org/annals_of_the_history_of_computing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472501/normal_603497143c53d.pdfIn PDF document text
    • https://cdn.sqhk.co/kofatuziwu/gXzIhf2/kukidufisesiga.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/iifxbJ8/70235148155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480893/normal_6057a53376ee7.pdfIn PDF document text
    • http://fesupopimos.66ghz.com/internal_audit_report_template_iso_27001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bizumel.epizy.com/1114973206.pdfIn PDF document text
    • http://siwavubixuvavil.rf.gd/wabibite.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_93ea3a2e35bf4a938f93cef911780d9c.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_ad083302102945dabbdb6d3274e85c4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/266673e5-a70b-4989-81b7-161f779cd667/61125454036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb20f3f-94e0-4a9f-bfbe-af4fb015db2c/new_moon_dec_14_2020_astrology.pdfIn PDF document text
    • http://poxotoromerolu.rf.gd/eenadu_news_paper_today_in_telugu_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b69de0-a3b4-4f6a-9d76-cb00a7f71c23/sawibexejafejirizunema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0409f8d-0a8b-4ed4-aad3-7d7d5ebf589a/whirlpool_refrigerator_ice_maker_troubleshooting.pdfIn PDF document text
    • http://gibapomidumitar.rf.gd/74200330625.pdfIn PDF document text
    • http://sitikaf.epizy.com/sumakirewowadap.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_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 4892 bytes
SHA-256: f833771d7c4722a4d23e079e560e76be26b4bbbd8d12ccfbb36bded48f08529d
font_01_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 11376 bytes
SHA-256: 796fff09f3a73aea04754f1a197dc9f141ef5b33d608ebcea238581427a7372c

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