Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18c1d5375573b23…

MALICIOUS

PDF

65.6 KB Created: 2021-03-26 13:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cbda2b80b2bcacd172476d0db329a6d SHA-1: b7bd1699b2970ea76f05c4077d2df19149eadda4 SHA-256: b18c1d5375573b23f78bb5367580b60a7715dd10aa95f454a9b949e67e05af26
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure malicious destinations. The document body, though heavily obfuscated, contains text related to a 'Treaty group crossword clue', likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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=treaty+group+crossword+clue
    • http://pejazadajenatew.getenjoyment.net/26683649866.pdf
    • https://batozovij.weebly.com/uploads/1/3/1/4/131455337/fetufiwepaxelifena.pdf
    • https://zurukuwimuso.weebly.com/uploads/1/3/4/3/134325804/8447757.pdf
    • http://rawoxaxevog.mygamesonline.org/79437451775.pdf
    • http://rixorevu.getenjoyment.net/xezidaluvam.pdf
    • http://vatidenow.medianewsonline.com/78949487340.pdf
    • https://cdn-cms.f-static.net/uploads/4387922/normal_6055209be0ea4.pdf
    • https://cdn-cms.f-static.net/uploads/4449990/normal_600e49551f65f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_f725a8d0dfcb4f03a4ddb61432ddc7a1.pdf?index=true
    • https://s3.amazonaws.com/dozore/market_analysis_report_samples.pdf
    • https://s3.amazonaws.com/dazinibonofobi/kufewipobarovo.pdf
    • https://s3.amazonaws.com/nimuwet/12601820154.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_78a62e2a34bd424caa2e87d0837ff322.pdf?index=true
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_d3a8d73824ac4c09a8109c9e3ccf2a26.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c5bd957e-fc0d-4d3a-b148-2f0516766669/air_force_one_pixel_desert_sand_goat.pdf
    • https://uploads.strikinglycdn.com/files/65b8c75f-2e01-4c71-8fb2-793d08dd818a/nikekoguwujetevubom.pdf
    • https://s3.amazonaws.com/gawabog/samsung_android_watch_reviews.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_off0000c528.bin
7e03b9812131e7ffadf0d1d507b94b91dba2ee018a18c4760c7b56fc509a0a06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC528 5384 bytes
font_01_sfnt_off0000d79c.bin
03ce45b158f46c9c272df5a539cdf958bb2bde530aeff5b89b89c0ad0ebce7e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 9932 bytes

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