Malicious PDF — malware analysis report

Static analysis result for SHA-256 75751963ef3f3cc8…

MALICIOUS

PDF

79.8 KB Created: 2021-03-20 22:34:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f97ac408480247ee06e469a5e0f68b6b SHA-1: a1e0925778737df0a5639734872fc1bde9e8aea6 SHA-256: 75751963ef3f3cc8eb2231dcafe38ac4acdc784c9733fb0aeb96e9350d3be2d7
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely involving embedded JavaScript to facilitate the redirection or download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=robotics+engineering+pdf+notes
    • https://votumojelobi.weebly.com/uploads/1/3/4/8/134848055/7071253.pdf
    • http://famozosivupiwij.sportsontheweb.net/92312170550.pdf
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/1694d.pdf
    • http://nikibolerobika.getenjoyment.net/11764950859.pdf
    • http://godotobekof.scienceontheweb.net/authorized_honda_lawn_mower_repair_near_me.pdf
    • https://bajupeboxima.weebly.com/uploads/1/3/5/3/135327322/c099337ef48eae.pdf
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/rosukotitude-vuzimilavaz-vewidisorizum.pdf
    • https://cdn.sqhk.co/menekilebuz/hKcl1gd/ducks_unlimited_banquet_items_2020.pdf
    • http://lnstagram-blue-badge-form.com/why_does_my_motion_light_flickerbh0oy.pdf
    • http://testvvd.xyz/forecasted_budget_templatec2hz8.pdf
    • http://copyright-infringement.business/563313282ip8wy.pdf
    • http://vadosixajobirug.mygamesonline.org/fallout_4_bobblehead_stand_mod.pdf
    • https://cdn.sqhk.co/luwanuriwaba/hgqJUjd/celestial_equator_definition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_fcd31fa47f664382810d837a54666b2e.pdf?index=true
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_99116739b2df452abb63c32a944f2537.pdf?index=true
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_bc1eba06c4a34f1cb1e617f07f1e331d.pdf?index=true
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_4255f2c616b44e619abae4cfcf18c364.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea17.bin
f3e5f1ce9b64d80440c2da79b6d42c5582685685eb72d24366afdee5a122ebf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 5228 bytes
font_01_sfnt_off0000fbf0.bin
7e895b42f4a1e5df18c516acb260663767e11afe879568d2fa1500d1ece2ecd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 4452 bytes
font_02_sfnt_off00010c51.bin
e50666c54dce978fa9213caaabcaeefe2f9b6435b2b4bacf8f3c4c99261b6e47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 10992 bytes

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