Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4b99bef5c92be7…

MALICIOUS

PDF

75.9 KB Created: 2021-01-25 14:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c2861189606b484622b79d585b18056 SHA-1: a729117b33a0e9ff659ebede5ad6c37e0c86b2d9 SHA-256: 5f4b99bef5c92be7fa900aaaa47aaceba96a8b94a77bd792420a5e4bb26f0525
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

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://jottigo.ru/123?utm_term=urology+procedure+codes PDF link annotation
    • https://cdn.sqhk.co/satidaruxami/whifBid/tiktok_banned_in_america_date.pdfIn PDF document text
    • http://fepemewavitik.66ghz.com/jelly_bean_dichotomous_key_lab_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/fgfifJb/mod_godzilla_king_monsters_after_credits.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/gculia3/kebunumusipefu.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/faa_airworthiness_directives.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_600b6d1e9d5d1.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/djdBR5O/giant_io_mod_apk_revdl.pdfIn PDF document text
    • http://nivawegokex.22web.org/kowivepuxobib.pdfIn PDF document text
    • http://gewebufokorilu.iblogger.org/63411757799.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/2417990.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://degivenumi.epizy.com/penadudaxixoxirulibikon.pdfIn PDF document text
    • http://vanepozimor.rf.gd/mayora_indah_annual_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/docker_ce_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/92014444622.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/musarivemud.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/wrestlemania_35_live_updates_bleacher_report.pdfIn PDF document text
    • http://xuxusemo.epizy.com/49155466858.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_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 5124 bytes
SHA-256: 2352cf45702f269e8d65a0c99ae85fd3401e1473e0230c73c4d88b22cb05c185
font_01_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 11088 bytes
SHA-256: 63f8b15d9c0d0dc7860cd1bb60b6cc13c13a96c286bd9854d2d88e3ac6695c5b

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