Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f47ef120b22f98b…

MALICIOUS

PDF

53.7 KB Created: 2020-11-05 21:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ac44b2f78d07870a8ffea1750cf88714 SHA-1: 623a4ea65748d08d1c579fba8a63e625c45965e0 SHA-256: 4f47ef120b22f98b94fe0ae12386314038f88dcc015e38d137078b6987060142
106 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that point to SEO redirectors, disguised as an educational worksheet. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests an attempt to download further payloads or redirect the user to a phishing site. No scripts were extracted, but the document structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • PDF carries website-builder CDN document link farm medium PDF_CDN_PDF_LINK_FARM
    PDF contains many clickable PDF links parked on website-builder CDNs or simple download gateways together with visible ebook, manual, or download lure text. This matches generated SEO document carriers used to route users through untrusted link/download chains; the PDF itself is an inert link carrier.
  • 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://trafffe.ru/strik?keyword=evolution+of+the+horse+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f883ef08dbc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f89419a1e2a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_5f9f7d57735d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393020/normal_5f90617a96f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449012/normal_5fa077a062ead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_5fa10eea33109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415308/normal_5f9d8d1603c21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5f94ad5729a23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393486/normal_5f9b4016b30ae.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/medetime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_5f9981ad5c3d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5f8efd331daa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_5f904ae52655e.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/ritual_magic_manual_griffin.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000091d0.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000091d0.bin)
    • https://uploads.strikinglycdn.com/files/05b5db69-333f-40dd-a533-38349f45986e/iso_iec_17065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5118bb1-63e0-4e50-9851-aff50f89f731/26317132595.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 extracted file (font_00_sfnt_off000091d0.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D0 5028 bytes
SHA-256: 034f773ad3565c519872874c7d207dfc8d3e3a65999ba367929a6f365fa9d924
font_01_sfnt_off0000a300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA300 11304 bytes
SHA-256: dcb2a5726062f25ead4ac44ac0841665f6133d5acc7efd8a4ff018a36de0d3c1

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