Malicious PDF — malware analysis report

Static analysis result for SHA-256 e680da73bb4af8e8…

MALICIOUS

PDF

75.7 KB Created: 2021-03-15 05:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 884764330a6dc4cef0ff0cd5391284ab SHA-1: 8ec2f6ae37cf36f7359041a142bfdead359c388a SHA-256: e680da73bb4af8e852e71138f6a367c423191c55f623592e6f024469a1695cb3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://nipisod.ru/wix?keyword=tampa+winter+jam+lacrosse
    • https://cdn.sqhk.co/vapatibu/uReifkq/rise_up_kane_instrumental_andra_day.pdf
    • https://cdn.sqhk.co/zuxafopagad/jhegfie/john_ness_concrete.pdf
    • https://cdn.sqhk.co/zoribakim/hbPijRI/10209750129.pdf
    • https://cdn.sqhk.co/gonibowijum/WEB1iiz/gatodafedojaj.pdf
    • https://cdn.sqhk.co/fagiseregu/eugjjdV/tiny_rails_train_setup.pdf
    • https://finejorokisitoj.weebly.com/uploads/1/3/4/4/134495390/xizowabudunegite.pdf
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/ae3b68.pdf
    • https://badosajag.weebly.com/uploads/1/3/1/4/131407507/28dae7eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_d80de072fd314ac4962b1b2aa45fb41a.pdf?index=true
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_229c6a3415c84300bdf3b36ebf9107c0.pdf?index=true
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_1dd65ccaada64584b9bc4b8392a35b4a.pdf?index=true
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_04590d36e2704c58b65fd44cf70b4658.pdf?index=true
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_9dcfe93fc5d9439abaf78a93c61d38da.pdf?index=true
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_902193f567104d5da4f8e5cc18b6f18d.pdf?index=true
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_2c5904baa5974a8ebe0e4fa9625461d5.pdf?index=true
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_0c766b67554345efb34876d1bea8f15f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb47.bin
b116ae611f36b71157ff6f87ad6abffaa6efb31a6e3c68b0343b74cc3dca93a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 5196 bytes
font_01_sfnt_off0000fcee.bin
d1fae7f46547f314f08d536d07f1788cf2c5fe7a2b1ee40b345192bf3f3407f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 10848 bytes

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