Malicious PDF — malware analysis report

Static analysis result for SHA-256 5613e5fea4d59534…

MALICIOUS

PDF

66.5 KB Created: 2021-02-11 01:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 38b4c88d19180912d0dd419d3c917edd SHA-1: ae72e25bd0c33eee2d2e64d8558012a4d8de97fd SHA-256: 5613e5fea4d59534322b0d2a1b5eca6686a1e23b5ab064400a09e8339f3be97a
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 of which are hosted on disposable domains or link farms, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'free download' and a popular book title, likely a lure to disguise the malicious nature of the links.

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://baarspo.ru/123?utm_term=rick+warren+purpose+driven+life+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fd19c7f14263.pdfIn PDF document text
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/kekijek-xiworologurava-xomewalum.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/DjehgQ4/fojatelojadesu.pdfIn PDF document text
    • https://mizewipexu.weebly.com/uploads/1/3/4/6/134609608/metobeg.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/cLqJPgi/7217288570.pdfIn PDF document text
    • https://kosofisipituje.weebly.com/uploads/1/3/5/3/135329454/janezaro.pdfIn PDF document text
    • https://nisikigibifug.weebly.com/uploads/1/3/0/8/130813528/zesedelopuzu-pusapewojevi.pdfIn PDF document text
    • https://nosirulewefew.weebly.com/uploads/1/3/4/2/134236253/8591269.pdfIn PDF document text
    • https://likudone.weebly.com/uploads/1/3/4/6/134681098/1729202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_5fd85b50ef08f.pdfIn PDF document text
    • https://wusowekop.weebly.com/uploads/1/3/2/7/132741020/dupamabefijomunok.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/jIkTypC/sagugivigate.pdfIn PDF document text
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/pupuguwiterawusav.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/xPczihK/65137771832.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/fHHghjd/34668230142.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/gaxuremewuger/pumebifoji.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/rafun.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/credit_suisse_deutschland_ag_annual_report.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_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 5372 bytes
SHA-256: 35736a831e051e070076a4c5ba73ea436cdd7353506944ffc0e50c2d80a337d7
font_01_sfnt_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 10988 bytes
SHA-256: 76df0c029b0469591264b95f1fcfae6c4013ccfb2645f23a60f0aef7c672a4bd

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