Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edd354716ac4118…

MALICIOUS

PDF

73.8 KB Created: 2021-03-07 07:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5efb2c661e4b7fa6b86c5959b49dcc23 SHA-1: 83cdd92763ad4824e4e500c133a3bb337cc2350f SHA-256: 9edd354716ac411852a20f82784eb65070eecb8922857d4debfb432fc0aed7f8
194 Risk Score

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. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://gimoguvi.ru/123?utm_term=fish+farming+book+in+bengali+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5fe2eb0d31610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_601715a3deee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_600b42472a7bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_5fe969d47e602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_6028f3b55a9b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_600dea609797d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_6018ca5b07124.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473622/normal_6009618820d3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5fd052d9bcce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_60192bdadbc69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_5fe6d16c169fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokumeki.rf.gd/william_s_burroughs_junky.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_101fd6889c134acdba9ab7f9f5d8676f.pdf?index=trueIn PDF document text
    • http://sevuvev.epizy.com/handlebar_moustache_trimming_guide.pdfIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_158b194654284c348430f73366cd0b10.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_64f88a3e39fc4f2a833c7fb65ea8d18c.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_13e3c4d23cc944fbbc7407294cd76793.pdf?index=trueIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_f24dada475d84cd48c6859ab82d404b6.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_522b153c1c2544cbb6c5e7f13d9c85fc.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_119f965577a943f88f15b4ff7bfd0de7.pdf?index=trueIn PDF document text
    • http://kubunixa.epizy.com/compare_and_contrast_cats_and_dogs_venn_diagram.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_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 5704 bytes
SHA-256: 477ae607d55db0b5f04e366eda35a46277f384cbab24f674b51982954b3b325a
font_01_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 10520 bytes
SHA-256: a3fe8f9c28d6dfe299503efceb467b3b8f5ba993cafde0d3d6e77a1cf8452493