Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9516529d69a42c…

MALICIOUS

PDF

68.3 KB Created: 2020-11-09 19:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 64674e96b2be095c25ae9211bb02eea8 SHA-1: daf46c21fed7ada332a3fa495db4023fe8fb0694 SHA-256: 8b9516529d69a42c5bd1be332135b2a3e57b18a973f6afc477def7a484aaefef
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffset.ru/123?keyword=cheap+buy+here+pay+here+cars+greensboro+nc PDF link annotation
    • https://susetizumuru.weebly.com/uploads/1/3/4/4/134461935/c1210427a99506b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f8784cd91be5.pdfIn PDF document text
    • https://mujetuzavos.weebly.com/uploads/1/3/4/2/134266282/d521220ea96090b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_5fa628d8c1cb6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/79326319439.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/moger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a843ec56-563e-4c52-b68f-b73bc697e798/totare.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/45432525388.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/wolfram_alpha_sum_of_series_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/el_camino_de_sherlock_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49811fe-8f1a-4588-bd46-2b2e22170a66/90825150691.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/68447198052.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/school_term_dates_2017_18_birmingham.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/5466151412.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/mafipemuwipusotuni.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/cancionero_de_rock_nacional_argentino_para_guitarra.pdfIn PDF document text
    • https://s3.amazonaws.com/mejediparaxi/zovelitodutenufezole.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/angelina_jolie_hitman_hired.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_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 5312 bytes
SHA-256: 32b28fec1337ab6de0bf54cc9e83360f48694d0bc4b415bb2fca07a385d2983f
font_01_sfnt_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 10740 bytes
SHA-256: 7979d28c4acdf427636205ee1c3cf7c42d0240b6ba2c22708c19c4a20cbf93dd

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