Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc08c7ed0ad48b0…

MALICIOUS

PDF

63.4 KB Created: 2021-02-20 09:27:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a653efb6266ec95826208a4ef30e096b SHA-1: 7f3b2f102c028c16990a7d78624026eb46096139 SHA-256: edc08c7ed0ad48b095885c1262d53ce5de9910224d98885963ce78f9b4fd6a23
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=keurig+vue+v500 PDF link annotation
    • http://siteznakomstv69.space/77593748278v6vel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5febed0fc8e76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fd7a54189ba7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5fee298fcfe2c.pdfIn PDF document text
    • http://centerverifybadge.com/common_noun_and_proper_noun_worksheet_for_grade_7n8f52.pdfIn PDF document text
    • http://decideyouself.fun/printable_worksheets_part_of_speechxpmk6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458633/normal_5fce701a72c00.pdfIn PDF document text
    • http://banquepopulaire-fr.org/bamopexikigupcbff.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/yhagg9N/environmental_studies_careers.pdfIn PDF document text
    • http://mebets.xyz/helix_jump_free_online_unblockedcvsvr.pdfIn PDF document text
    • http://ketrovk.xyz/db_super_free_wallpaper_hd_1080x1920kzwra.pdfIn PDF document text
    • http://aycotoro6.xyz/80812003698n943s.pdfIn PDF document text
    • http://nncucuucuc.space/75885362210b6fcd.pdfIn PDF document text
    • http://ryukzak.digital/nunemumozemutejogorifodmqgn3.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/jcjf9IE/19456913921.pdfIn PDF document text
    • https://cdn.sqhk.co/mimufedu/rgdhgub/90690947502.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB36 4728 bytes
SHA-256: ef3b2621ee802d899d703fe4f8fb60a5aae544371392784dcae039c77e900367
font_01_sfnt_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 10864 bytes
SHA-256: 622742481692ea0a0c731f8a447e9f3eea6e158a83527d24b91d6758eadb7bbf

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