Malicious PDF — malware analysis report

Static analysis result for SHA-256 decde856466be7f9…

MALICIOUS

PDF

37.1 KB Created: 2020-11-06 09:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c4d28312b72151a7d616bdd9bff2983e SHA-1: 1fbd25f3fb31c08eff321bb2ef28725cdc7cf313 SHA-256: decde856466be7f938842c2d26f6a9abeadde19fe2ad9ffb9b8af1ac1a0556ae
84 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and a heuristic firing for 'PDF_SEO_UTM_REDIRECTOR_LINK' indicating a phishing lure. The document body, though partially garbled, contains text related to a school and a URL, suggesting an attempt to trick the user into downloading malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs points to a download or redirection workflow.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/123?keyword=hopewell+school+in+glastonbury+ct PDF link annotation
    • https://xomipuladijig.weebly.com/uploads/1/3/4/4/134401164/ab01380ad41af6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f95979a24538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_5f9fe22042700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423696/normal_5fa049efd7e90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_5f9f9bb3a61bd.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/wotareropajewub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382770/normal_5f98bb0932d0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f8c53dfcc825.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca9faa76-c502-4646-ae8d-f2f71ab88f91/the_island_grille.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e502bf5e-acbf-4f18-9e1a-c3fd1d4851e2/xaronol.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/tebulomiviza.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/golden_state_warriors_preseason_schedule_2018.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

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_off00005064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5064 5488 bytes
SHA-256: 57b63fe088c5ca334ea9c9bbe5c4e9d8751adfaf2ee9690b4051736b484aeb95
font_01_sfnt_off00006323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6323 10844 bytes
SHA-256: 4498f8f9f7b9226452851085bf5a17956f104d3af8b6644faf485af0cb7bc811

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