Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b48cc4b50c98134…

MALICIOUS

PDF

79.8 KB Created: 2021-04-23 10:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0b59871d1c7cebbeba12fc3018d987c7 SHA-1: e91e7a2eede93f633aa82aa51534342f7f1e365a SHA-256: 4b48cc4b50c98134e39e1e65990a028482f02ae9989866b6be7d13e701d7dafd
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=free+printable+fun+2nd+grade+math+worksheets PDF link annotation
    • http://tokudujadi.medianewsonline.com/how_to_get_cleared_from_credit_reference_bureau.pdfIn PDF document text
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/3162a854.pdfIn PDF document text
    • https://bupowuxa.weebly.com/uploads/1/3/5/3/135317106/zatujarujaka_dutetamokulevo.pdfIn PDF document text
    • https://nupewaxupojiga.weebly.com/uploads/1/3/4/0/134042887/7822295.pdfIn PDF document text
    • https://lixepugoguzezum.weebly.com/uploads/1/3/4/1/134132265/fuxasaka.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/ihHiegg/zajegesexes.pdfIn PDF document text
    • https://kukitarigawe.weebly.com/uploads/1/3/0/7/130776277/4633328.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/agesci_camminiamo_insieme.pdfIn PDF document text
    • http://nawavidosuk.medianewsonline.com/avengers_infinity_war_full_script.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/bojusufapejuxekafemi.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/eT0pdje/ronekefan.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/ffc631ef47a930a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_55d65e20bd554b0ca9ff70f27ed84801.pdf?index=trueIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_e4ce03f70a474efd9dc15ab67a9aefa0.pdf?index=trueIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_db7ef979f24d41068f7b842c50a4cabd.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_f863200f6dd14d4b953220e3c9d6aeba.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_bc23e81945f6474ea527459b2494d19d.pdf?index=trueIn 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_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 5840 bytes
SHA-256: eeef204d212a04489413546afde04b3c72008c009fefff55972dfd9c4319e941
font_01_sfnt_off00010ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 11360 bytes
SHA-256: 2758035b2d0747eb95f33dd6e958513f3e1a41fdc0dcd66bf4fbf4ee8c5bee9f

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