Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1a899918c262ec…

MALICIOUS

PDF

108.9 KB Created: 2021-03-24 00:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d63b2c6b81a80f01f1085626795f2639 SHA-1: dbc4a9d0d28c889e1fd840f02f2872980af46e13 SHA-256: 5e1a899918c262eca570a037f072300d16730faadaeb3a44ec768cf3ddc299e2
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used in SEO link farms to manipulate search engine rankings. One of the embedded URLs, 'https://bologen.ru/wix?keyword=gta+5+strategy+guide+pdf+free+download', suggests a lure related to downloading a game guide. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification yielded a high probability of maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links, including one pointing to a potential phishing domain, indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=gta+5+strategy+guide+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4486346/normal_602dea32d3740.pdf
    • http://wusozupu.mypressonline.com/bring_me_to_life_sheet_music.pdf
    • http://fuvesozufinefi.medianewsonline.com/50077564430.pdf
    • http://kugewezebuvigiw.mygamesonline.org/thug_kitchen_cookbook_author.pdf
    • https://static.s123-cdn-static.com/uploads/4378381/normal_5ff4888ac4dac.pdf
    • https://cdn-cms.f-static.net/uploads/4405946/normal_6010ddb859507.pdf
    • https://cdn-cms.f-static.net/uploads/4413583/normal_605793272efd2.pdf
    • http://vurujupafowutox.mypressonline.com/dynamic_shear_rheometer.pdf
    • https://static.s123-cdn-static.com/uploads/4383917/normal_5ffadaeb73fec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/45d356cd-6053-409d-a749-3b0e213d99ad/gujenuxozarelawujow.pdf
    • https://uploads.strikinglycdn.com/files/608efb54-3058-498b-b8cf-5a5fe772172a/how_old_was_mr_darcy_in_pride_and_prejudice.pdf
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_ce5a27a96e8240fbb583dddeb440d75b.pdf?index=true
    • https://63150c49-9e7f-4923-bc7a-1e4049050ce6.filesusr.com/ugd/cba449_3efd66dcf5c84cc6bd5ba2f11e449c13.pdf?index=true
    • http://gumomexad.onlinewebshop.net/budget_proposal_template.pdf
    • https://uploads.strikinglycdn.com/files/7ca91d2b-58e2-4ab5-989a-d7ef4ae6e278/rizubiso.pdf
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_fc21615a54fc420f88cc5b4fdef15d7d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/65e7b625-3114-4fc6-ab93-6b08d525da6f/introduction_to_heat_transfer_8th_edition.pdf
    • http://pidodexogejax.myartsonline.com/12671318314.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_ef9104687c3d4ef08784ce048062865c.pdf?index=true
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_19b2a76e0ad6442a899e1a5dcff00bdf.pdf?index=true
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_f7341176901449eba622131117efc1c3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7766339d-9d45-47e2-b797-7c334afed8ef/76599752175.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016de1.bin
4a62a4919e75b03a5c8bb297851c1ee0a6f5e00b1f24fb94c71a9b07afcfaddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE1 5556 bytes
font_01_sfnt_off000180f2.bin
f5689fcd6ff51bc31d3a85113bc64c4b21b7865e8df59f35b6ee9d646e40a620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x180F2 10856 bytes

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