Malicious PDF — malware analysis report

Static analysis result for SHA-256 8312e7a008ac7ad0…

MALICIOUS

PDF

76.1 KB Created: 2021-03-11 10:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f237346473002d31605bf931c2152871 SHA-1: ae638ddba169a9594e6ae273e0c744d091c9ce76 SHA-256: 8312e7a008ac7ad0a895e304a545b9ad885ec09b3fd6196bdbdab2cdc4688489
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to potentially malicious domains, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS. The document body, though heavily obfuscated, suggests a lure related to 'practice test pdf'. The presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/strik?utm_term=new+sat+math+practice+test+pdf PDF link annotation
    • https://zalovodidana.weebly.com/uploads/1/3/4/0/134040409/3147854.pdfIn PDF document text
    • http://lg-copyright.com/sunubimanafosanezagudiro4cqr8.pdfIn PDF document text
    • https://lefafikof.weebly.com/uploads/1/3/0/9/130969708/682586.pdfIn PDF document text
    • https://vakakarixo.weebly.com/uploads/1/3/4/5/134590502/2436788.pdfIn PDF document text
    • http://czecheducation.space/jenewomanawenedafipe4s7ij.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/8579585.pdfIn PDF document text
    • http://alcexpress3.xyz/bruce_lee_songs_download_starmusiqtl1vb.pdfIn PDF document text
    • http://jigunemav.22web.org/24822542677.pdfIn PDF document text
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/5267197.pdfIn PDF document text
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/vufevo_gejabe.pdfIn PDF document text
    • http://trackcreditscore.info/fashion_magazine_template_envato5h0uv.pdfIn PDF document text
    • http://ionatr.fun/78180368517hbq97.pdfIn PDF document text
    • https://bewizujire.weebly.com/uploads/1/3/2/3/132303264/2461714.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20ca478-3451-408a-a67d-a34f4e8affd0/learn_french_through_english_in_30_days_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636c8c2a-fc40-481f-b9b4-3ba33502ea01/66246098256.pdfIn PDF document text
    • http://fubegamo.epizy.com/palayathu_amman_tamil_movie_full.pdfIn PDF document text
    • http://xiramegakasivi.epizy.com/22311779121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9c5c54-9fb9-471f-8d40-6a86796e475c/33398292631.pdfIn PDF document text
    • http://demuremapinob.epizy.com/19149792131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d92cbc5-47e4-4432-90d9-82b20975c551/63466750747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde863e2-79b5-463d-af6a-eba04ba4cf52/75065424397.pdfIn PDF document text
    • http://sejokuze.rf.gd/in_praise_of_shadows.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_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 5424 bytes
SHA-256: 175a08becbdb03955f9987d8b7e27def58c1d49e340d98cfd47f1261ba020c2f
font_01_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 10836 bytes
SHA-256: c1cc4d8508a06fe12b910a1ee104459b0bd84eeadad77b15681739d24c52e451

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